`R2 put: Unspecified error` on remote binding

[hexcowboy]

What versions & operating system are you using?

Wrangler 4.20.5

Please provide a link to a minimal reproduction

No response

Describe the Bug

Letting my local wrangler instance sit idle for a while eventually causes requests to R2 remote bindings to throw. PUTs to R2 specifically throw an error (see error below).

Restarting my wrangler dev fixes this. I'm able to provide more details if needed.

Please provide any relevant error logs

▲ [WARNING] workerd/api/r2-rpc.c++:242: warning: R2 error response does not contain the CF-R2-Error header.; response.statusCode = 400

error [Error: put: Unspecified error (0)]

[penalosa]

Thanks for reporting this! Would you be able to provide a reproduction repo that demonstrates the issue?

[hexcowboy]

Hi @penalosa here is a very basic reproduction: https://github.com/hexcowboy/cf-workers-remote-binding-bug

➜ curl -X POST http://localhost:3009/upload/test-3
Internal Server Error%

To reproduce, let the dev server sit idle. I'm not sure exactly how long this takes but after 2 hours of idle I reproduced it in the screenshot above.

[hexcowboy]

Also seeing this for other R2 operations like head

▲ [WARNING] workerd/api/r2-rpc.c++:122: warning: R2 error response does not contain the CF-R2-Error header.; respons
e.statusCode = 400


✘ [ERROR] [Error: head: Unspecified error (0)]

[bastiankistner]

I am experiencing the same error. I'll go back to using an S3 implementation for now.

[CarmenPopoviciu]

hi @hexcowboy,

thank you so much for the repro 🙏 . I noticed that in your repro you are using the experimental remote mode, and was wondering if you are experiencing the same issue in remote mode proper