sse-preflight (Keploy repro)

This is a tiny Go app meant to reproduce the Keploy replay failure where an OPTIONS CORS preflight to an SSE endpoint (recorded on port 8047) is replayed against the normal HTTP port (8000) and returns 404.

What the app does

• :8000 (normal HTTP): only serves GET /health (everything else is 404)
• :8047 (SSE): serves:
  • OPTIONS /subscribe/student/events → 200 + CORS headers (no text/event-stream Content-Type)
  • GET /subscribe/student/events → 200 + Content-Type: text/event-stream

Run the server (without Keploy)

cd sse-preflight
go run ./cmd/server

In another terminal:

go run ./cmd/client --url "http://localhost:8047/subscribe/student/events?doubtId=repro" --host "doubt-service.example.com"

You should see status=200 OK.

Record + replay with Keploy (to reproduce the failure)

Prereq: make sure Keploy Enterprise auth is configured (for example KEPLOY_API_KEY), otherwise keploy record/test will prompt for an API key.

1) Record

Terminal A:

keploy record -c "go run ./cmd/server"

Terminal B (during the 20s window):

go run ./cmd/client --url "http://localhost:8047/subscribe/student/events?doubtId=repro" --host "doubt-service.example.com"

2) Replay

keploy test -c "go run ./cmd/server"

Expected: the preflight testcase fails with EXPECT 200 vs ACTUAL 404, and in debug logs you should see the key part:

• Overriding port with app_port (8047)
• Config port overrides recorded app_port (8000 overrides 8047)
• Final resolved target uses localhost:8000/...