Building a go library fails due to proxy errors (Default setup)

[wolverian]

See this run: https://github.com/wolverian/obs/actions/runs/15276079160

The errors look like this (reformatted for legibility):

[2025-05-27 13:06:37] [build-stderr] 	
    go.opentelemetry.io/contrib/bridges/otelslog: 
      go.opentelemetry.io/contrib/bridges/otelslog@v0.11.0:
        Get "https://proxy.golang.org/go.opentelemetry.io/contrib/bridges/otelslog/@v/v0.11.0.zip":
          proxyconnect tcp: dial tcp :80: connect: connection refused

a bit higher in the log there's also a somewhat suspicious looking proxy env variable error:

ERROR Unable to parse proxy configurations error="unexpected end of JSON input"

[mbg]

Hi @wolverian 👋🏻

Thank you for reporting this issue. We have rolled out a change here recently and it seems like that's not working right. I'll look into getting this rolled back in Default Setup to temporarily resolve the problem until we can ship a fix.

[mbg]

@wolverian CodeQL 2.21.4 is now out and, as soon as your scans start using that (which should be automatic), you should see this working correctly again. Feel free to let us know if there are any more issues, though.