Commit 97c8a96

Browse files
jasnelladuh95
jasnell
authored and
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quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com> PR-URL: #63483 Backport-PR-URL: #64675 Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96

1 file changed

Lines changed: 38 additions & 0 deletions

File tree

‎doc/api/quic.md‎

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
the necessary intermediate(s). Do not include the root certificate (clients
132+
already have it in their trust store). Avoid cross-signed intermediates when
133+
the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
certificates with a single small intermediate, while others require multiple
137+
large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)

, '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");
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)

, '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");
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)

, '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");
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})();
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var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)

, '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
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)

, '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
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)

, '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
Commit 97c8a96
Browse files
jasnelladuh95
jasnell
authored and
aduh95
committed
quic: add doc note about certificate size limitations
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: #63483
Backport-PR-URL: #64675
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
1 parent 42aa3f6 commit 97c8a96
1 file changed
Lines changed: 38 additions & 0 deletions
File tree
‎doc/api/quic.md‎
Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -104,6 +104,42 @@ to negotiate the application protocol (via ALPN), authenticate the server (and
104104
optionally the client), exchange transport parameters, and establish shared keys
105105
for encryption.
106106

107+
#### Certificate size and handshake performance
108+
109+
QUIC includes an anti-amplification limit ([RFC 9000 Section 8.1][]) that
110+
restricts the server to sending at most three times the data received from
111+
the client before the client's address is validated. Because the client's
112+
Initial packet is typically around 1200 bytes, the server can send at most
113+
approximately 3600 bytes before it must wait for the client to acknowledge.
114+
115+
The server's initial response is dominated by its TLS certificate chain. If
116+
the certificate chain exceeds the amplification limit, the handshake requires
117+
an additional round trip — the server must pause, wait for the client's
118+
acknowledgement, and then continue sending the remainder of the certificate.
119+
This eliminates QUIC's 1-RTT handshake advantage over TCP+TLS and can add
120+
50–100 ms or more of latency on the first connection, depending on the network
121+
path.
122+
123+
To avoid this, servers should use compact certificate chains:
124+
125+
***Use ECDSA certificates** (P-256 or P-384) rather than RSA. ECDSA keys and
126+
 signatures are significantly smaller. A typical ECDSA P-256 certificate chain
127+
 with one intermediate is approximately 1.5–2 KB, well within the amplification
128+
 limit. An equivalent RSA-2048 chain is often 3–5 KB, which may exceed it.
129+
130+
***Minimize the certificate chain.** Include only the leaf certificate and
131+
 the necessary intermediate(s). Do not include the root certificate (clients
132+
 already have it in their trust store). Avoid cross-signed intermediates when
133+
 the self-signed root is already widely trusted.
134+
135+
***Prefer certificate authorities with short chains.** Some CAs issue
136+
 certificates with a single small intermediate, while others require multiple
137+
 large RSA intermediates. The choice of CA directly affects handshake latency.
138+
139+
Certificate compression ([RFC 8879][]) can also address this issue by
140+
compressing the certificate chain during the handshake. However, Node.js does
141+
not currently support TLS certificate compression.
142+
107143
### Applications
108144

109145
Every `QuicSession` is associated with a single application protocol, negotiated
@@ -4036,8 +4072,10 @@ throughput issues caused by flow control.
40364072
[Callback error handling]: #callback-error-handling
40374073
[JSON-SEQ]: https://www.rfc-editor.org/rfc/rfc7464
40384074
[NSS Key Log Format]: https://udn.realityripple.com/docs/Mozilla/Projects/NSS/Key_Log_Format
4075+
[RFC 8879]: https://www.rfc-editor.org/rfc/rfc8879
40394076
[RFC 8999]: https://www.rfc-editor.org/rfc/rfc8999
40404077
[RFC 9000]: https://www.rfc-editor.org/rfc/rfc9000
4078+
[RFC 9000 Section 8.1]: https://www.rfc-editor.org/rfc/rfc9000#section-8.1
40414079
[RFC 9001]: https://www.rfc-editor.org/rfc/rfc9001
40424080
[RFC 9002]: https://www.rfc-editor.org/rfc/rfc9002
40434081
[RFC 9114]: https://www.rfc-editor.org/rfc/rfc9114
0 commit comments
Comments
 (0)