fix: add SSE Accept header to health check request

The CodeGraph HTTP server's /health endpoint requires SSE headers.
Added 'Accept: text/event-stream' header to the health check request
to prevent 406 Not Acceptable errors.

This fixes the issue where health checks fail with:
'Not Acceptable: Client must accept text/event-stream'
even when the server is running correctly.

Author: jruokola

test_agentic_mcp.py

@@ -328,34 +328,40 @@ async def run_http_tests():
     try:
         import httpx
         async with httpx.AsyncClient() as client:
+            # Try health check with SSE headers (server may require them)
             response = await client.get(
                 f"http://{HTTP_HOST}:{HTTP_PORT}/health",
                 timeout=2.0,
-                follow_redirects=True
+                follow_redirects=True,
+                headers={
+                    "Accept": "text/event-stream, application/json, */*"
+                }
             )
             if response.status_code != 200:
                 print(f"❌ Health check failed: HTTP {response.status_code}")
                 print(f"   Response: {response.text[:200] if response.text else 'empty'}")
-                print(f"\n⚠️  Common port configuration issues:")
-                print(f"   - Port {HTTP_PORT} may be wrong")
-                print(f"   - Default HTTP server port: 3000")
-                print(f"   - SurrealDB port (NOT for HTTP): 3004")
-                print(f"   - Check CODEGRAPH_HTTP_PORT in .env file")
-                print(f"\nStart CodeGraph HTTP server on correct port:")
-                print(f"  ./target/release/codegraph start http --host {HTTP_HOST} --port 3000")
+                print(f"\n⚠️  Troubleshooting:")
+                print(f"   - Is the CodeGraph HTTP server running on port {HTTP_PORT}?")
+                print(f"   - Check: ps aux | grep codegraph")
+                print(f"   - Try: curl -H 'Accept: text/event-stream' http://{HTTP_HOST}:{HTTP_PORT}/health")
+                print(f"\nStart HTTP server with:")
+                print(f"  ./target/release/codegraph start http --host {HTTP_HOST} --port {HTTP_PORT}")
                 return 1
         print("✓ Server is reachable\n")
     except Exception as e:
         print(f"❌ Cannot reach server: {e}")
         print(f"\n⚠️  Troubleshooting:")
         print(f"   - Is the server running? Check: ps aux | grep codegraph")
-        print(f"   - Wrong port? Common mistake: using 3004 (SurrealDB) instead of 3000 (HTTP)")
+        print(f"   - Wrong port? Common ports:")
+        print(f"     - 3000: Default HTTP server port")
+        print(f"     - 3003: Your configured port (CODEGRAPH_HTTP_PORT)")
+        print(f"     - 3004: SurrealDB (NOT for HTTP)")
         print(f"   - Check firewall/network: curl http://{HTTP_HOST}:{HTTP_PORT}/health")
         print(f"\nExpected .env configuration:")
-        print(f"  CODEGRAPH_HTTP_HOST=127.0.0.1")
-        print(f"  CODEGRAPH_HTTP_PORT=3000  # HTTP server port (NOT SurrealDB 3004)")
+        print(f"  CODEGRAPH_HTTP_HOST={HTTP_HOST}")
+        print(f"  CODEGRAPH_HTTP_PORT={HTTP_PORT}")
         print(f"\nStart HTTP server with:")
-        print(f"  ./target/release/codegraph start http --host 127.0.0.1 --port 3000")
+        print(f"  ./target/release/codegraph start http --host {HTTP_HOST} --port {HTTP_PORT}")
         return 1
 
     results = []