nodejs/undici

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An HTTP/1.1 client, written from scratch for Node.js

Stars: 7.7k
Forks: 879
Open beginner issues: 0
Indexed issues: 186
Avg merge: 2d 16h
Merged PRs (30d): 68

Dominant language: JavaScript
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

185 open issues indexed

`FormData` body with an errored `Blob` part crashes the process with an unhandled rejection instead of erroring the body stream (regression in 7.20.0) Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

nodejs/undici#5835 · Opened Sep 16, 2026
Support maxRequestsPerClient for HTTP/2 sessions Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 52/100

nodejs/undici#5787 · 1 comment · Opened Sep 8, 2026
fetch follow does not dump 3xx bodies and hangs when the redirect body is large Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

nodejs/undici#5728 · 1 comment · Opened Aug 27, 2026
deduplicate: aborting the primary request rejects the other callers in the group Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

nodejs/undici#5711 · Opened Aug 24, 2026
Socks5ProxyAgent: SOCKS5 handshake/auth timeout leaks the underlying socket Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

nodejs/undici#5704 · Opened Aug 19, 2026
Nightly tests are failing Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/undici#5671 · 1 comment · Opened Aug 8, 2026
Cache.add() and Cache.addAll() never settle for a response with a body Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

nodejs/undici#5615 · 2 comments · Opened Jul 29, 2026
fetch: SharedArrayBuffer-backed view as request body is silently coerced to a string (lossy data corruption) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

nodejs/undici#5596 · Opened Jul 26, 2026
`request()` with a cross-realm FormData (e.g. Node's global) hangs forever instead of erroring; via the legacy globalDispatcher claim this also breaks undici v6 clients in the same process Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

nodejs/undici#5520 · 1 comment · Opened Jul 6, 2026
cache: 304 revalidation response never updates the stored entry on the synchronous path (RFC 9111 §4.3.4) — entry stays stale forever Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

nodejs/undici#5505 · 1 reaction · Opened Jul 4, 2026
cache interceptor ignores request "Cache-Control: max-age=0" (falsy check) — breaks fetch(url, {cache:'no-cache'}) through composed cache dispatchers Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

nodejs/undici#5504 · 2 comments · Opened Jul 4, 2026
Importing undici v8 silently breaks Node's bundled fetch via the legacy globalDispatcher bridge (v8's stricter core Request rejects opts the bundled v6 core accepts — e.g. request-set Content-Length) Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

nodejs/undici#5500 · 3 comments · Opened Jul 4, 2026
Support for HTTP/3 (QUIC) Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

nodejs/undici#5471 · 1 comment · 8 reactions · Opened Jun 30, 2026
DispatchOptions.upgrade accepts boolean in types but runtime rejects it Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

nodejs/undici#5466 · Opened Jun 30, 2026
[flaky] test\websocket\receive.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5264 · Opened May 7, 2026
[flaky] test\mock-pool.js Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/undici#5263 · Opened May 7, 2026
[flaky] test\pipeline-pipelining.js Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/undici#5259 · Opened May 7, 2026
[flaky] test\socket-timeout.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5256 · Opened May 7, 2026
[flaky] test\interceptors\cache-query-params.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5254 · 1 comment · Opened May 7, 2026
[flaky] test\issue-810.js Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

nodejs/undici#5249 · Opened May 6, 2026
[flaky] test\interceptors\decompress.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5248 · Opened May 6, 2026
[flaky] test\http2-abort.js Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

nodejs/undici#5245 · 3 comments · Opened May 6, 2026
[flaky] test\node-test\diagnostics-channel\post.js Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/undici#5244 · Opened May 6, 2026
[flaky] test\node-test\diagnostics-channel\error.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5240 · Opened May 6, 2026
[flaky] test\issue-1270.js Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/undici#5239 · 1 comment · Opened May 6, 2026
[flaky] test\fetch\cookies.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5238 · Opened May 6, 2026
[flaky] test\websocket\issue-3697-2399493917.js Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/undici#5223 · Opened May 6, 2026
[flaky] test\issue-4389.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5210 · Opened May 5, 2026
[flaky] test\websocket\issue-2679.js Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#5201 · Opened May 5, 2026
[flaky] test/h2c-client.js Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

nodejs/undici#5186 · Opened May 4, 2026
[flaky] test\websocket\fragments.js Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/undici#5180 · Opened May 4, 2026
[2026] Tracking issue for flaky tests Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

nodejs/undici#5177 · 4 comments · 1 reaction · Opened May 4, 2026
Please review proposed OSS-Fuzz integration Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/undici#5154 · 1 comment · Opened May 1, 2026
Request with ReadableStream body causes 'expected non-null body source' assertion failure in undici 7.x Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

nodejs/undici#5004 · 3 comments · 3 reactions · Opened Apr 9, 2026
WebSocket: Network error cause missing Open

websocket

Difficulty 3/5 1-2 days Newbie friendliness 68/100

nodejs/undici#4991 · Opened Apr 7, 2026
Use RFC 2606 TLDs for documentation and tests Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

nodejs/undici#4866 · 2 comments · Opened Mar 5, 2026
BalancedPool deteriorates to a single point of failure after outages Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/undici#4839 · 2 comments · Opened Feb 24, 2026
Request Prioritization Interceptor Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/undici#4766 · 1 comment · 3 reactions · Opened Jan 24, 2026
WebSocket allows more than one CONNECTING connection to the same (host, port) Open

bug websocket

Difficulty 4/5 3-5 days Newbie friendliness 45/100

nodejs/undici#4743 · 4 comments · Opened Jan 17, 2026
WebSocket transitions back from CLOSED to CLOSING Open

bug websocket

Difficulty 3/5 1-2 days Newbie friendliness 70/100

nodejs/undici#4742 · 1 comment · Opened Jan 17, 2026
WebSocket events fire synchronously during close() instead of asynchronously Open

bug websocket

Difficulty 3/5 1-2 days Newbie friendliness 64/100

nodejs/undici#4741 · 3 comments · Opened Jan 17, 2026
`fetch()` fails or returns an opaque response for a redirected cross-origin URL Open

bug fetch

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/undici#4740 · 1 comment · Opened Jan 16, 2026
Add WebSocket lifecycle, frame, and frame-error diagnostic events for DevTools Protocol support Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/undici#4673 · 4 comments · Opened Nov 17, 2025
Support for node --build-snapshot Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/undici#4669 · 1 comment · Opened Nov 13, 2025
Extend ResponseError interceptor body parsing capabilities Open

enhancement interceptors

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/undici#4667 · 1 comment · Opened Nov 12, 2025
More Descriptive Error When WebSocket Closes with Code 1006 Open

Difficulty 3/5 1-2 days Newbie friendliness 62/100

nodejs/undici#4625 · 6 comments · Opened Oct 16, 2025
ReadableStream hangs on Windows named pipes when proxying file streams Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

nodejs/undici#4616 · 5 comments · 3 reactions · Opened Oct 7, 2025
Process does not exit after aborting a request to an unresponsive host Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

nodejs/undici#4405 · 4 comments · 3 reactions · Opened Aug 12, 2025
AI created PRs Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/undici#4403 · 12 comments · 10 reactions · Opened Aug 10, 2025
Add support for resolving wildcard subdomains *.localhost Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

nodejs/undici#4391 · 4 comments · 2 reactions · Opened Aug 7, 2025

nodejs/undici

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