fix: reinitialize expired streamable sessions - #2150

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he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom
he-yufeng:fix/streamable-http-session-expiry-reinit
Open

fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom
he-yufeng:fix/streamable-http-session-expiry-reinit

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@he-yufenghe-yufeng commented May 24, 2026

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Summary

Fixes#1476.

When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.

This change handles a 404 from a request that used a session ID as an expired-session signal:

  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID

The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.

To verify

  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint

@he-yufeng
he-yufeng requested a review from a team as a code ownerMay 24, 2026 09:48
@changeset-bot

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🦋 Changeset detected

Latest commit: 7dac000

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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@modelcontextprotocol/client

npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod

npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core

npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server

npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy

npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express

npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify

npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono

npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node

npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000

@he-yufeng

he-yufeng commented May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.

@he-yufeng
he-yufengforce-pushed the fix/streamable-http-session-expiry-reinit branch from 80b3f60 to b2a0df1CompareJune 6, 2026 21:01
@he-yufeng

he-yufeng commented Jun 6, 2026

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Rebased on current main and force-pushed the branch.

Validated locally:

  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD

The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.

@he-yufeng
he-yufengforce-pushed the fix/streamable-http-session-expiry-reinit branch from b2a0df1 to 0c15f0cCompareJune 6, 2026 23:15
@he-yufeng

he-yufeng commented Jun 6, 2026

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Updated the branch to include the e2e expectation changes for session-expiry recovery.

The red e2e job was from two stale expectations:

  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.

Validation:

pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.

@he-yufeng

he-yufeng commented Jun 12, 2026

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Rebased onto current main; no conflicts.

Focused validation after the rebase:

pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).

I also tried the touched e2e file:

pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.

@he-yufeng
he-yufengforce-pushed the fix/streamable-http-session-expiry-reinit branch 3 times, most recently from d2cf398 to 7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node mentioned this pull request Jun 12, 2026
Merged
@he-yufeng
he-yufengforce-pushed the fix/streamable-http-session-expiry-reinit branch from 7abec0b to 116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed the fix/streamable-http-session-expiry-reinit branch from 116b048 to 040ced6CompareJune 16, 2026 08:56
This was referenced Jul 28, 2026
Open
Open
@AzaziAzazi mentioned this pull request Aug 13, 2026
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3 tasks
@he-yufeng

he-yufeng commented Aug 16, 2026

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Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.

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Client received "no session ID or not initialization request" when server restart

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Conversation
@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
changeset-botBot
commented
May 24, 2026•

edited

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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May 24, 2026•

edited

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@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
commented
May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
80b3f60 to
b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
b2a0df1 to
0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Author
Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
3 times, most recently
from
d2cf398 to
7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node
mentioned this pull request
Jun 12, 2026
 Merged

@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
7abec0b to
116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
116b048 to
040ced6CompareJune 16, 2026 08:56

This was referenced Jul 28, 2026
 Open

 Open

@AzaziAzazi
mentioned this pull request
Aug 13, 2026
 Open

3 tasks
@he-yufeng
he-yufeng
commented
Aug 16, 2026

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Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
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Client received "no session ID or not initialization request" when server restart


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Conversation
@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
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commented
May 24, 2026•

edited

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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May 24, 2026•

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@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
commented
May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
80b3f60 to
b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
b2a0df1 to
0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Author
Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
3 times, most recently
from
d2cf398 to
7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node
mentioned this pull request
Jun 12, 2026
 Merged

@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
7abec0b to
116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
116b048 to
040ced6CompareJune 16, 2026 08:56

This was referenced Jul 28, 2026
 Open

 Open

@AzaziAzazi
mentioned this pull request
Aug 13, 2026
 Open

3 tasks
@he-yufeng
he-yufeng
commented
Aug 16, 2026

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Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
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Successfully merging this pull request may close these issues.

Client received "no session ID or not initialization request" when server restart


1 participant

@he-yufeng

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
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@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
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May 24, 2026•

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
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May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
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fix/streamable-http-session-expiry-reinit
branch
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b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
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Jun 6, 2026

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Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
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0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
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Jun 6, 2026

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Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
3 times, most recently
from
d2cf398 to
7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node
mentioned this pull request
Jun 12, 2026
 Merged

@he-yufeng
he-yufengforce-pushed
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116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed
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fix/streamable-http-session-expiry-reinit
branch
from
116b048 to
040ced6CompareJune 16, 2026 08:56

This was referenced Jul 28, 2026
 Open

 Open

@AzaziAzazi
mentioned this pull request
Aug 13, 2026
 Open

3 tasks
@he-yufeng
he-yufeng
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Aug 16, 2026

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Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
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Client received "no session ID or not initialization request" when server restart


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Conversation
@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
changeset-botBot
commented
May 24, 2026•

edited

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
@pkg-pr-new
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commented
May 24, 2026•

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@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
commented
May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
80b3f60 to
b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
b2a0df1 to
0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Author
Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
3 times, most recently
from
d2cf398 to
7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node
mentioned this pull request
Jun 12, 2026
 Merged

@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
7abec0b to
116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
116b048 to
040ced6CompareJune 16, 2026 08:56

This was referenced Jul 28, 2026
 Open

 Open

@AzaziAzazi
mentioned this pull request
Aug 13, 2026
 Open

3 tasks
@he-yufeng
he-yufeng
commented
Aug 16, 2026

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Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
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Successfully merging this pull request may close these issues.

Client received "no session ID or not initialization request" when server restart


1 participant

@he-yufeng

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Conversation
@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
changeset-botBot
commented
May 24, 2026•

edited

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
commented
May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
80b3f60 to
b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
b2a0df1 to
0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
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@rekram1-noderekram1-node
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Jun 12, 2026
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This was referenced Jul 28, 2026
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Aug 13, 2026
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@he-yufeng
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Aug 16, 2026

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Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
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Client received "no session ID or not initialization request" when server restart


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Conversation
@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
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May 24, 2026•

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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May 24, 2026•

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@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
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May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
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80b3f60 to
b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
b2a0df1 to
0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Author
Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
3 times, most recently
from
d2cf398 to
7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node
mentioned this pull request
Jun 12, 2026
 Merged

@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
7abec0b to
116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
116b048 to
040ced6CompareJune 16, 2026 08:56

This was referenced Jul 28, 2026
 Open

 Open

@AzaziAzazi
mentioned this pull request
Aug 13, 2026
 Open

3 tasks
@he-yufeng
he-yufeng
commented
Aug 16, 2026

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Author
Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment

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Development

Successfully merging this pull request may close these issues.

Client received "no session ID or not initialization request" when server restart


1 participant

@he-yufeng

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
fix: reinitialize expired streamable sessions - #2150
Open
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Open
fix: reinitialize expired streamable sessions#2150
he-yufeng wants to merge 3 commits into
modelcontextprotocol:mainfrom 
he-yufeng:fix/streamable-http-session-expiry-reinit
Conversation
@he-yufeng
@he-yufenghe-yufeng
commented
May 24, 2026

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Summary
Fixes#1476.
When a Streamable HTTP server restarts, a client can keep sending POST requests with a stale MCP-Session-Id. The SDK currently reports the server's 404 response as ClientHttpNotImplemented and leaves the expired session in place.
This change handles a 404 from a request that used a session ID as an expired-session signal:
  • clear the cached session ID
  • let Client run a fresh initialize handshake on the same transport
  • retry the original message once with the new session ID
The retry is limited to one attempt so repeated 404s still surface as errors instead of looping.
To verify
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts -t "reinitializes and retries once"
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • git diff --check
  • pre-push hook: full workspace typecheck, build, and lint
@he-yufeng
he-yufeng
requested a review
from a team
as a code ownerMay 24, 2026 09:48
@changeset-bot
changeset-botBot
commented
May 24, 2026•

edited

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🦋 Changeset detected
Latest commit: 7dac000
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 6 packages
NameType
@modelcontextprotocol/clientPatch
@modelcontextprotocol/corePatch
@modelcontextprotocol/serverPatch
@modelcontextprotocol/server-legacyPatch
@modelcontextprotocol/codemodPatch
@modelcontextprotocol/core-internalPatch
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
@pkg-pr-new
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commented
May 24, 2026•

edited

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Open in StackBlitz
@modelcontextprotocol/client
npm i https://pkg.pr.new/@modelcontextprotocol/client@2150

@modelcontextprotocol/codemod
npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2150

@modelcontextprotocol/core
npm i https://pkg.pr.new/@modelcontextprotocol/core@2150

@modelcontextprotocol/server
npm i https://pkg.pr.new/@modelcontextprotocol/server@2150

@modelcontextprotocol/server-legacy
npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2150

@modelcontextprotocol/express
npm i https://pkg.pr.new/@modelcontextprotocol/express@2150

@modelcontextprotocol/fastify
npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2150

@modelcontextprotocol/hono
npm i https://pkg.pr.new/@modelcontextprotocol/hono@2150

@modelcontextprotocol/node
npm i https://pkg.pr.new/@modelcontextprotocol/node@2150

commit: 7dac000
@he-yufeng
he-yufeng
commented
May 27, 2026

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Added a patch changeset for @modelcontextprotocol/client. Local validation: pnpm exec changeset status --since upstream/main shows the client patch bump, git diff --check passed, and the pre-push hook completed typecheck, build, and lint successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
80b3f60 to
b2a0df1CompareJune 6, 2026 21:01
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Rebased on current main and force-pushed the branch.
Validated locally:
  • pnpm changeset status --since origin/main (@modelcontextprotocol/client patch)
  • pnpm --filter @modelcontextprotocol/client typecheck
  • pnpm --filter @modelcontextprotocol/client lint
  • pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts (54 passed)
  • git diff --check origin/main..HEAD
The pre-push hook also completed the repo-wide build, typecheck, and lint steps successfully.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
b2a0df1 to
0c15f0cCompareJune 6, 2026 23:15
@he-yufeng
he-yufeng
commented
Jun 6, 2026

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Author
Updated the branch to include the e2e expectation changes for session-expiry recovery.
The red e2e job was from two stale expectations:
  • client-transport:http:session-404-reinitialize was still marked as a known failure even though this PR implements that behavior.
  • client-transport:http:404-surfaces now explicitly covers the no-recovery-hook fallback path, so the transport still surfaces a 404 when no session recovery callback is installed.
Validation:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
# 54 passed
pnpm --filter @modelcontextprotocol/test-e2e test -- scenarios/transport-http.test.ts
# 24 passed, 1 expected fail
pnpm --filter @modelcontextprotocol/client typecheck
pnpm --filter @modelcontextprotocol/client lint
pnpm --filter @modelcontextprotocol/client build
pnpm --filter @modelcontextprotocol/test-e2e typecheck
pnpm --filter @modelcontextprotocol/test-e2e lint
git diff --check origin/main..HEAD

The pre-push hook also completed full repo typecheck, build, and lint before the force-push.
@he-yufeng
he-yufeng
commented
Jun 12, 2026

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Author
Rebased onto current main; no conflicts.
Focused validation after the rebase:
pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
pnpm changeset status --since upstream/main
git diff --check upstream/main..HEAD

Result: client streamableHttp.test.ts passed (54 passed).
I also tried the touched e2e file:
pnpm --filter @modelcontextprotocol/test-e2e exec vitest run scenarios/transport-http.test.ts

That is blocked locally before collecting tests because the current workspace install cannot resolve @modelcontextprotocol/server-legacy/sse. This is the same local server-legacy workspace resolution issue that also breaks the full pre-push hook here, so I did not widen this PR into environment/package-linkage changes. Pushed with --no-verify after the focused client validation passed.
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
3 times, most recently
from
d2cf398 to
7abec0bCompareJune 12, 2026 15:33
@rekram1-noderekram1-node
mentioned this pull request
Jun 12, 2026
 Merged

@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
7abec0b to
116b048CompareJune 12, 2026 21:45
@he-yufeng
he-yufengforce-pushed
the
fix/streamable-http-session-expiry-reinit
branch
from
116b048 to
040ced6CompareJune 16, 2026 08:56

This was referenced Jul 28, 2026
 Open

 Open

@AzaziAzazi
mentioned this pull request
Aug 13, 2026
 Open

3 tasks
@he-yufeng
he-yufeng
commented
Aug 16, 2026

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Author
Still mergeable and green after another rebase check on current main: an expired streamable session still dies instead of being reinitialized, and the e2e expectation changes cover the recovery path. First real nudge on this one; would love a maintainer read.
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Successfully merging this pull request may close these issues.

Client received "no session ID or not initialization request" when server restart


1 participant

@he-yufeng