nodejs / nodejs/undici

`UND_ERR_SOCKET` in fetch

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bug
Dominant language
JavaScript
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Description

Sometimes fetch ends up with exception:

{
  cause: {
    name: "SocketError",
    code: "UND_ERR_SOCKET",
    socket: {
      localAddress: "192.168.1.33",
      localPort: 12345,
      remoteAddress: "X.Y.Z.W",
      remotePort: 443,
      remoteFamily: "IPv4",
      timeout: undefined,
      bytesWritten: 651,
      bytesRead: 441,
    },
    message: "other side closed",
    stack: "SocketError: other side closed\n    at TLSSocket.onSocketEnd (node:internal/deps/undici/undici:9499:26)\n    at TLSSocket.emit (node:events:524:35)\n    at endReadableNT (node:internal/streams/readable:1359:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:82:21)"
  },
  message: "fetch failed",
  stack: "TypeError: fetch failed\n    at Object.fetch (node:internal/deps/undici/undici:12789:11)\n    at async Object.xyzFunc..."
}

Unfortunately, we don't have a reproducible code, because of complexity of application, the initial fetch requests work, but after making some further fetch we sporadically get the error. Do you have any suggestions? Have tried all workaround found in internet, but nothing worked. The exact request which fails with node fetch, works from postman.

( Windows 11, tested results below with v19.6, however same issue happens in 18.14)

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No reproducible code, file, or test is provided. Start by isolating the sporadic fetch request on Windows and comparing it with the same request in Postman; done means identifying a reliable reproduction and documenting or fixing the cause of the UND_ERR_SOCKET failure.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, node.js
Domain
networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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