bug: location header absolute/relative specificity

[SgtPooki]

I don't think the conformance testing suite should care about whether a redirect is using an absolute or relative URI, but maybe I am missing something.

Basically, verified-fetch is redirecting to an absolute URI, and the host of the absolute URI matches the host of the requested resource, so we could return a relative reference, but I don't think we should need to.

See https://httpwg.org/specs/rfc9110.html#field.location

�=== RUN   TestUnixFSDirectoryListingOnSubdomainGateway/redirect_dir_listing_to_URL_with_trailing_slash/Header_Location

    run.go:58: 
        Name: redirect dir listing to URL with trailing slash
        Hint: 
        
        Error: Header 'Location' expected '/%!c(MISSING)4%!/(MISSING)%!c(MISSING)4%!/(MISSING)', got 'http://bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i.ipfs.localhost:3441/%!C(MISSING)4%!/(MISSING)%!C(MISSING)4%!/(MISSING)'
        
        Expected Request:
        {
          "method": "GET",
          "path": "/ą/ę",
          "headers": {
            "Host": "bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i.ipfs.localhost:3441"
          }
        }
        
        Actual Request:
        GET /%C4%85/%C4%99 HTTP/1.1
        Host: bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i.ipfs.localhost:3441
        User-Agent: ipfs/gateway-conformance/dev
        Accept-Encoding: gzip
        
        
        
        Expected Response:
        {
          "statusCode": 301,
          "headers": [
            {
              "key": "Location",
              "check": {}
            }
          ]
        }
        
        Actual Response:
        HTTP/1.1 301 Moved Permanently
        Transfer-Encoding: chunked
        Cache-Control: public, max-age=29030400, immutable
        Connection: keep-alive
        Date: Tue, 04 Feb 2025 19:10:08 GMT
        Etag: "bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i"
        Keep-Alive: timeout=5
        Location: http://bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i.ipfs.localhost:3441/%C4%85/%C4%99/
        X-Ipfs-Path: /ipfs/bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i/%C4%85/%C4%99
        
        
        
�--- FAIL: TestUnixFSDirectoryListingOnSubdomainGateway/redirect_dir_listing_to_URL_with_trailing_slash/Header_Location (0.00s)

[SgtPooki]

Note that I quickly modified verified-fetch to return redirects to relative urls and i'm still getting an error for this test:

�=== RUN   TestUnixFSDirectoryListingOnSubdomainGateway/redirect_dir_listing_to_URL_with_trailing_slash/Header_Location

    run.go:58: 
        Name: redirect dir listing to URL with trailing slash
        Hint: 
        
        Error: Header 'Location' expected '/%!c(MISSING)4%!/(MISSING)%!c(MISSING)4%!/(MISSING)', got '/%!C(MISSING)4%!/(MISSING)%!C(MISSING)4%!/(MISSING)'
        
        Expected Request:
        {
          "method": "GET",
          "path": "/ą/ę",
          "headers": {
            "Host": "bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i.ipfs.localhost:3441"
          }
        }
        
        Actual Request:
        GET /%C4%85/%C4%99 HTTP/1.1
        Host: bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i.ipfs.localhost:3441
        User-Agent: ipfs/gateway-conformance/dev
        Accept-Encoding: gzip
        
        
        
        Expected Response:
        {
          "statusCode": 301,
          "headers": [
            {
              "key": "Location",
              "check": {}
            }
          ]
        }
        
        Actual Response:
        HTTP/1.1 301 Moved Permanently
        Transfer-Encoding: chunked
        Cache-Control: public, max-age=29030400, immutable
        Connection: keep-alive
        Date: Tue, 04 Feb 2025 19:22:36 GMT
        Etag: "bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i"
        Keep-Alive: timeout=5
        Location: /%C4%85/%C4%99/
        X-Ipfs-Path: /ipfs/bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i/%C4%85/%C4%99
        
        
        
�--- FAIL: TestUnixFSDirectoryListingOnSubdomainGateway/redirect_dir_listing_to_URL_with_trailing_slash/Header_Location (0.00s)

[gammazero]

Gateway conformance tests should accept both absolute and relative URLs, but that means we need testing both.