Torrent grab fails with "fetch failed" error when adding torrent to client

[seannymurrs]

BookGrab successfully completes the grab process up to the point where it attempts to send the torrent to the download client, but the operation fails with a fetch failed error and the torrent is never added.

Environment

• BookGrab version: latest from repository (as of Feb 2026)
• Install method: Docker
• Host OS: macOS

Expected Behavior
After selecting/grabbing an item, BookGrab should add the torrent to the configured download client.

Actual Behavior
The grab attempt fails and BookGrab reports:

{
  result: {
    success: false,
    message: 'Failed to add torrent',
    error: 'fetch failed'
  }
}

{
  body: {
    torrentUrl: 'https://www.myanonamouse.net/tor/download.php/...',
    category: 'audiobook'
  }
}

Error adding torrent: TypeError: fetch failed
    at async d (.next/server/app/api/grab/route.js:1:1272)
    at async p (.next/server/app/api/grab/route.js:1:2327) {

  [cause]: [Error [RequestContentLengthMismatchError]:
  Request body length does not match content-length header] {
    code: 'UND_ERR_REQ_CONTENT_LENGTH_MISMATCH'
  }
}

{
  result: {
    success: false,
    message: 'Failed to add torrent',
    error: 'fetch failed'
  }
}

No torrent is added to the download client.

Relevant Logs

{
  result: {
    success: false,
    message: 'Failed to add torrent',
    error: 'fetch failed'
  }
}

{
  body: {
    torrentUrl: 'https://www.myanonamouse.net/tor/download.php/...',
    category: 'audiobook'
  }
}

Error adding torrent: TypeError: fetch failed
    at async d (.next/server/app/api/grab/route.js:1:1272)
    at async p (.next/server/app/api/grab/route.js:1:2327) {

  [cause]: [Error [RequestContentLengthMismatchError]:
  Request body length does not match content-length header] {
    code: 'UND_ERR_REQ_CONTENT_LENGTH_MISMATCH'
  }
}

{
  result: {
    success: false,
    message: 'Failed to add torrent',
    error: 'fetch failed'
  }
}

Additional Notes

• BookGrab appears able to retrieve the torrent URL successfully.
• The failure occurs specifically during the step where the torrent is added to the download client.
• This happens consistently for every grab attempt.

Reproducibility
Occurs every time a grab is attempted.