This sample demonstrates how to test a Go application that serves both standard HTTP endpoints and Server-Sent Events (SSE) on different ports using Keploy.

It uses Caddy as a reverse proxy to route traffic to the appropriate ports based on the request path.

• Go (1.21 or later)
• Docker (for running Caddy)
• Keploy

• HTTP Server: Listens on port 8000. Handles API requests.
• SSE Server: Listens on port 8047. Handles real-time event streams.
• Caddy (Router): Listens on port 80. Routes /subscribe/* to port 8047 and everything else to 8000.

Run the following command to start Caddy in a Docker container. This will simulate a production-like routing environment where a gateway handles traffic distribution.

docker rm -f sse-router 2>/dev/null || true
docker run --name sse-router --rm -p 80:80 \
  --add-host=host.docker.internal:host-gateway \
  -v "$PWD/Caddyfile.record:/etc/caddy/Caddyfile" \
  caddy:2-alpine

Open a new terminal to run the application with Keploy recording enabled.

keploy record

Send requests to the Caddy router (localhost:80).

Standard HTTP Request:

# 1. Health Check                                  
curl -i "http://localhost:8000/health"                                       

# 2. Simple Hello                                               
curl -i "http://localhost:8000/api/hello"               

# 3. Echo (with message)                                 
curl -i "http://localhost:8000/api/echo?msg=Greetings"                           

# 3b. Echo (empty/default message)
curl -i "http://localhost:8000/api/echo"

# 4. Add Numbers
curl -i "http://localhost:8000/api/add?a=50&b=25"

# 5. Get Current Time
curl -i "http://localhost:8000/api/time"

# 6. Get Resource by ID
curl -i "http://localhost:8000/api/resource/user-123"

SSE Request (Student):

curl -N -H "Accept: text/event-stream" \
  "http://localhost/subscribe/student/events?doubtId=abc"

SSE Request (Teacher):

curl -N -H "Accept: text/event-stream" \
  "http://localhost/subscribe/teacher/events?teacherId=t-42"

Note: You can verify that traffic is being routed correctly by checking the "port" field in JSON responses or the server logs.

Once you have recorded the test cases, you can stop the recording (Ctrl+C) and run the tests.

keploy test

Keploy will replay the recorded traffic and verify that the responses match the expected output, ensuring that routing and logic remain consistent.