fix(errors): pass through client error status codes

[alukach]

What I'm changing

I noticed that when an ApiClientError is thrown (e.g. the source API returns a 401 for a private repository), the proxy throws a 502 gateway error. This obfuscates the underlying error. Instead, we should pass that error through from the proxy.

Running into this error

I have a disabled repo at https://source.coop/alukach/test-repo. The API returns a 401 when I attempt to access it: https://source.coop/api/v1/repositories/alukach/test-repo
However, the data proxy currently returns a 502 because the 401:

▶ curl https://data.source.coop/alukach/test-repo/xyz --verbose
// ...
< HTTP/2 502 
< date: Thu, 29 May 2025 19:42:09 GMT
< content-length: 203
< x-version: 0.1.28
< access-control-allow-credentials: true
< vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers
< 
* Connection #0 to host data.source.coop left intact
Internal Server Error: api threw a client error (url https://source.coop/api/v1/repositories/alukach/test-repo, status 401, message {"code":401,"message":"You are not authorized to perform this action"})%       

How I did it

Updated the ResponseError implementation for BackendError to correctly pass through client error status codes from ApiClientError, ensuring that the appropriate status code is returned in the response.

How to test it

PR Checklist

• This PR has no breaking changes.
• I have updated or added new tests to cover the changes in this PR.
• This PR affects the Source Cooperative Frontend & API,
  and I have opened issue/PR #XXX to track the change.

Related Issues