[Help Wanted]: FetchError when loading Copilot suggestions with proxy

[dmitryd20]

Before Reporting

• [X] I have checked FAQ, and there is no solution to my issue
• [X] I have searched the existing issues, and there is no existing issue for my issue

Describe your issue

I have been using Copilot for Xcode with proxy for several months and it was working perfectly. At some moment suggestions stopped working. Details:

1. Application shows "Status: OK" when using proxy.

   

2. When triggering suggestions loading from Xcode editor, I see the following two errors from CopilotForXcodeExtensionService:

   • Request Error: (FetchError) Hostname/IP does not match certificate's altnames: Host: copilot-proxy.githubusercontent.com. is not in the cert's altnames: DNS:*.gist.githubusercontent.com, DNS:gist.githubusercontent.com
   • Error on ghost text request: (FetchError) Hostname/IP does not match certificate's altnames: Host: copilot-proxy.githubusercontent.com. is not in the cert's altnames: DNS:*.gist.githubusercontent.com, DNS:gist.githubusercontent.com

3. All of my iOS teammates have the same error.

4. My Android teammates use the same proxy with Jetbrains IDE Copilot plugin and it still works without any problems.

What have I tried:

• Using no proxy / using VPN connection
• Reinstalling Copilot for Xcode with clearing all stored preferences
• trying different versions of Copilot for Xcode

[intitni]

It looks like the language server was trying to access https://copilot-proxy.githubusercontent.com but the certificate was incorrect. What happens if you access it directly in Safari?

How did you setup the proxy? Which version of Node are you using?

If you are using self signed certificate, please use the workaround in this issue.

If you would like to try the latest version of the language server, you can download it from copilot.vim and extract the dist folder into ~/Library/Application\ Support/com.intii.CopilotForXcode/GitHub\ Copilot/executable/copilot

[dmitryd20]

Tried the latest Language Server version from Copilot.vim v1.31. And it works without any errors/warnings.

So, the reason was inside the Language Server. Thanks for help!