chore: fix flaky retry test

[zirain]

error logs:

=== RUN   TestE2E/Retry/retry-on-500
    helpers.go:627: 2026-01-22T03:55:41.477029637Z: Conditions matched expectations
    helpers.go:627: 2026-01-22T03:55:41.477087956Z: Route gateway-conformance-infra/retry-route Parents matched expectations
    retry.go:64: 2026-01-22T03:55:41.481949432Z: query count envoy_cluster_upstream_rq_retry{envoy_cluster_name="httproute/gateway-conformance-infra/retry-route/rule/0"} before: 0
    retry.go:66: 2026-01-22T03:55:41.481994556Z: Making GET request to host  via http://[fc00:f853:ccd:e793::cb]/status/500
    roundtripper.go:234: 2026-01-22T03:55:41.482118367Z: Sending Request:
        < GET /status/500 HTTP/1.1
        < Host: [fc00:f853:ccd:e793::cb]
        < User-Agent: Go-http-client/1.1
        < X-Echo-Set-Header: 
        < Accept-Encoding: gzip
        < 
        < 
        
        
    roundtripper.go:262: 2026-01-22T03:55:41.482866824Z: Received Response:
        < HTTP/1.1 503 Service Unavailable
        < Connection: close
        < Date: Thu, 22 Jan 2026 03:55:41 GMT
        < Content-Length: 0
        < 
        < 
        
        
    retry.go:73: failed to compare request and response: expected status code to be one of [500], got 503. CRes: &{503 0 HTTP/1.1 map[Content-Length:[0] Date:[Thu, 22 Jan 2026 03:55:41 GMT]] <nil> []}
    http.go:257: 2026-01-22T03:56:11.483864371Z: timeout while waiting after 30 attempts, 0/0 successes

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.75%. Comparing base (fa32a93) to head (6e9fdeb).
⚠️ Report is 82 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8020      +/-   ##
==========================================
+ Coverage   73.70%   73.75%   +0.05%     
==========================================
  Files         237      237              
  Lines       35703    35703              
==========================================
+ Hits        26314    26333      +19     
+ Misses       7529     7514      -15     
+ Partials     1860     1856       -4     

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[arkodg]

why does moving from /status to / fix this ?

[zirain]

// we can not use /status/200 here because the response is empty and
// failed to pass the "eventually consistent" check

[arkodg]

can you please elaborate

[zirain]

k exec -it deployments/sleep -- curl backend:3000/
{
 "path": "/",
 "host": "backend:3000",
 "method": "GET",
 "proto": "HTTP/1.1",
 "headers": {
  "Accept": [
   "*/*"
  ],
  "User-Agent": [
   "curl/8.16.0"
  ]
 },
 "namespace": "default",
 "ingress": "",
 "service": "",
 "pod": "backend-869c8646c5-c7rzg"
}%
❯ k exec -it deployments/sleep -- curl backend:3000/status/2000

the function expected a JOSN response when resposne code is 200.