fix: return 404 for invalid MCP session IDs in examples #389 - #1331

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fix: return 404 for invalid MCP session IDs in examples #389#1331
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Motivation and Context

How Has This Been Tested?

  • Not run (not requested)

Breaking Changes

  • none

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs

@lraveri
lraveri requested a review from a team as a code ownerDecember 22, 2025 18:10
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⚠️ No Changeset found

Latest commit: 0ef72f6

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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commit: 51707c4

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Thanks for the contribution! Closing in favor of #1770.

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Streamable HTTP examples use incorrect status code for invalid session IDs

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fix: return 404 for invalid MCP session IDs in examples #389 - #1331
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Closed
fix: return 404 for invalid MCP session IDs in examples #389#1331
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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
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requested a review
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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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commit: 51707c4
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Streamable HTTP examples use incorrect status code for invalid session IDs


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

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fix: return 404 for invalid MCP session IDs in examples #389 - #1331
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fix: return 404 for invalid MCP session IDs in examples #389#1331
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Dec 22, 2025•

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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
lraveri
requested a review
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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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commit: 51707c4
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Streamable HTTP examples use incorrect status code for invalid session IDs


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

Skip to content
fix: return 404 for invalid MCP session IDs in examples #389 - #1331
Closed
lraveri wants to merge 2 commits into
modelcontextprotocol:mainfrom 
lraveri:feat/issue-389
Closed
fix: return 404 for invalid MCP session IDs in examples #389#1331
lraveri wants to merge 2 commits into
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lraveri:feat/issue-389
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Dec 22, 2025•

edited

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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
lraveri
requested a review
from a team
as a code ownerDecember 22, 2025 18:10
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Dec 22, 2025•

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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1331

commit: 51707c4
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Mar 26, 2026
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Thanks for the contribution! Closing in favor of #1770.
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Streamable HTTP examples use incorrect status code for invalid session IDs


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@lraveri@felixweinberger

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} 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: return 404 for invalid MCP session IDs in examples #389 - #1331
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lraveri wants to merge 2 commits into
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lraveri:feat/issue-389
Closed
fix: return 404 for invalid MCP session IDs in examples #389#1331
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Dec 22, 2025•

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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
lraveri
requested a review
from a team
as a code ownerDecember 22, 2025 18:10
@changeset-bot
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Dec 22, 2025•

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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1331

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1331

commit: 51707c4
@felixweinbergerfelixweinberger
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Mar 26, 2026
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Thanks for the contribution! Closing in favor of #1770.
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Streamable HTTP examples use incorrect status code for invalid session IDs


2 participants

@lraveri@felixweinberger

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

Skip to content
fix: return 404 for invalid MCP session IDs in examples #389 - #1331
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lraveri wants to merge 2 commits into
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lraveri:feat/issue-389
Closed
fix: return 404 for invalid MCP session IDs in examples #389#1331
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@lraveri
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Dec 22, 2025•

edited

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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
lraveri
requested a review
from a team
as a code ownerDecember 22, 2025 18:10
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Dec 22, 2025•

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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1331

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1331

commit: 51707c4
@felixweinbergerfelixweinberger
mentioned this pull request
Mar 26, 2026
 Merged

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Mar 26, 2026

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Thanks for the contribution! Closing in favor of #1770.
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Streamable HTTP examples use incorrect status code for invalid session IDs


2 participants

@lraveri@felixweinberger

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

Skip to content
fix: return 404 for invalid MCP session IDs in examples #389 - #1331
Closed
lraveri wants to merge 2 commits into
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lraveri:feat/issue-389
Closed
fix: return 404 for invalid MCP session IDs in examples #389#1331
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@lraveri
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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
lraveri
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as a code ownerDecember 22, 2025 18:10
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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1331

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1331

commit: 51707c4
@felixweinbergerfelixweinberger
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Mar 26, 2026
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Thanks for the contribution! Closing in favor of #1770.
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Streamable HTTP examples use incorrect status code for invalid session IDs


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fix: return 404 for invalid MCP session IDs in examples #389 - #1331
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lraveri wants to merge 2 commits into
modelcontextprotocol:mainfrom 
lraveri:feat/issue-389
Closed
fix: return 404 for invalid MCP session IDs in examples #389#1331
lraveri wants to merge 2 commits into
modelcontextprotocol:mainfrom 
lraveri:feat/issue-389
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@lraveri
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commented
Dec 22, 2025•

edited

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Motivation and Context
How Has This Been Tested?
  • Not run (not requested)
Breaking Changes
  • none
Types of changes
  •  Bug fix (non-breaking change which fixes an issue)
  •  New feature (non-breaking change which adds functionality)
  •  Breaking change (fix or feature that would cause existing functionality to change)
  •  Documentation update
Checklist
  •  I have read the MCP Documentation
  •  My code follows the repository's style guidelines
  •  New and existing tests pass locally
  •  I have added appropriate error handling
  •  I have added or updated documentation as needed
Additional context
  • Session handling logic adjusted in multiple example servers to distinguish missing vs invalid session IDs
@lraveri
lraveri
requested a review
from a team
as a code ownerDecember 22, 2025 18:10
@changeset-bot
changeset-botBot
commented
Dec 22, 2025•

edited

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⚠️ No Changeset found
Latest commit: 0ef72f6
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Dec 22, 2025

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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1331

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1331

commit: 51707c4
@felixweinbergerfelixweinberger
mentioned this pull request
Mar 26, 2026
 Merged

9 tasks
@felixweinberger
felixweinberger
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Mar 26, 2026

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Contributor
Thanks for the contribution! Closing in favor of #1770.
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Successfully merging this pull request may close these issues.

Streamable HTTP examples use incorrect status code for invalid session IDs


2 participants

@lraveri@felixweinberger