Fix: Added X-Accel-Buffering: no to resolve MCP SSE timeout on HF Spaces

backend/main.py

@@ -91,9 +91,9 @@ async def mcp_discovery(req: Request):
 
 @app.get("/mcp/sse")
 async def mcp_sse_stream(req: Request):
-    """Handshake with manual CORS headers for SSE"""
+    """Handshake with manual CORS and Proxy Fixes"""
     async def event_generator():
-        # Immediate endpoint event with relative path
+        # Immediate endpoint event
         yield f"event: endpoint\ndata: /mcp/invoke\n\n"
         while True:
             await asyncio.sleep(20)
@@ -103,6 +103,7 @@ async def mcp_sse_stream(req: Request):
     response.headers["Access-Control-Allow-Origin"] = "*"
     response.headers["Cache-Control"] = "no-cache"
     response.headers["Connection"] = "keep-alive"
+    response.headers["X-Accel-Buffering"] = "no" # Fix for Hugging Face/Nginx buffering
     return response
 
 @app.post("/mcp/invoke")