Requests from Firefox Extension always delayed 500ms due to timeout in proxy server

[tylerccarson]

Current behavior

There's an artificial 500ms delay to every HTTP request issued from the background page on a Firefox Extension. For whatever reason, this issue does not seem to come up for Chrome Extensions.

cypress:proxy:http:util:prerequests Never received pre-request or url without pre-request for request POST-http://localhost:8000/api/rest/vault/sync_down after waiting 500ms. Continuing without one. +546ms

Desired behavior

No response

Test code to reproduce

Repo to demonstrate: https://github.com/tylerccarson/cy-firefox-ext-prerequest-delay.

Start the local server npm run cypress:server, and then run Cypress in interactive mode in another process. You will see that the Chrome test passes, while if fails in Firefox.

Cypress Version

13.9.0

Node version

20.12.2

Operating System

macOS 14.5

Debug Logs

No response

Other

No response

[jennifer-shehane]

@tylerccarson Could you provide some information on how we could recreate this situation?

[tylerccarson]

@tylerccarson Could you provide some information on how we could recreate this situation?

@jennifer-shehane I've just uploaded a demo repo that demonstrates the failing case in Firefox and the passing case in Chrome. Please let me know how else I can assist if needed.

[jennifer-shehane]

@tylerccarson Thanks for the reproducible example. I do see this behavior when I run this.

[eisenpony]

I am seeing this randomly after Cypress is running for a short time.
In my case, it occurs in Chrome running in WSL.

2024-10-04T21:38:47.738Z cypress:proxy:http:util:prerequests Never received pre-request or url without pre-request for request GET-http://localhost:5173/__cypress/src/src/... after waiting 2000ms. Continuing without one.

I'm also seeing this in my extension logs -- seems related, but these start immediately, not just after the server starts logging "Never received pre-request..." and responding slowly.

 cypress:driver:proxy-logging unmatched responseReceived event {requestId: '223490.1912', status: 200, headers: {…}} +42ms
 cypress:driver emitted: 'request:event' - with args: 'response:received' +42ms {requestId: '223490.1912', status: 200, headers: {…}}

[cypress-app-bot]

This issue has not had any activity in 180 days. Cypress evolves quickly and the reported behavior should be tested on the latest version of Cypress to verify the behavior is still occurring. It will be closed in 14 days if no updates are provided.

[tylerccarson]

Issue still exists, as of Cypress 14.2.1 (latest)