Cannot connect to websocket with wrangler dev

[universse]

🐛 Bug report

Describe the bug

I keep getting this message when trying to connect to websocket using wrangler dev. Non-websocket routes work fine though.

[2021-05-04 22:54:59] GET dev-bug.ulrjch.workers.dev/ws HTTP/1.1 400 Bad Request
[2021-05-04 22:55:08] GET dev-bug.ulrjch.workers.dev/ HTTP/1.1 200 OK

Reproduce the bug

1. Clone https://github.com/universse/wrangler-bug
2. Enter account_id in wrangler.toml
3. Run wrangler dev
4. Open index.html
5. Above error messages would appear in terminal.

Optional: It works fine when published.

1. Run wrangler publish
2. Replace websocket link in index.html
3. Open index.html
4. Websocket connection is successful.

Expected behavior

Should be able to connect to websocket using wrangler dev.

Environment and versions

Fill out the following information about your environment.

• operating system: Windows 10 Home
• output of wrangler -V: wrangler 1.16.0-durable-objects-rc.0
• output of node -v: v15.10.0
• content of wrangler.toml: per repo

[universse]

I have tried type: "webpack" for wrangler.toml as well. It doesn't work still.

[Electroid]

We currently do not support WebSocket debugging in wrangler dev, but obviously we should. Will get back to you as we figure out the complexity for this addition.

[dan-online]

Hey it's September now, how's this doing? I've found the same issue with wrangler dev and can confirm it only works when published.

$ wrangler -V
wrangler 1.19.3

[threepointone]

We've scheduled to fix this in q4 (ie - before the end of this year) Until then, the recommendation is to use miniflare #2079 (comment) Sorry for the delay on this, we'll fix it soon.

[seeekr]

Just a heads up to maybe update the note at https://developers.cloudflare.com/workers/learning/using-websockets#writing-a-websocket-server in case this should already be fixed in production!

[threepointone]

Good catch! sent a PR that removes the message cloudflare/cloudflare-docs#3082. Thanks!