Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

unsupported permessage-deflate parameter: "client_max_window_bits=15" from client

Open
#443 9 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
go
Domain
networking

Research direction

Start in dial.go around lines 268-300, where the server's permessage-deflate extension parameters are parsed. Reproduce the handshake with client_max_window_bits=15 and trace why that parameter is rejected; done means the valid server reply no longer produces the unsupported-parameter error.

Written by the indexing model from the issue text.

Description

If a websocket server reply with extension permessage-deflate; client_max_window_bits=15 an error happens:

unsupported permessage-deflate parameter: "client_max_window_bits=15"

at
https://github.com/nhooyr/websocket/blob/bd07a64be6809ef46b76fff5ef7263ef7641980f/dial.go#L268-L300

Dominant language
Go
Stars
5.5k
Forks
377
PR merge metrics
No merged PRs in 30d

Contributor guide

No contributing guide indexed for this repository

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.

More from coder/websocket

All issues in coder/websocket

Similar issues

More Go issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.