Fix backend service startup: add websockets and use subprocess for servers

app.py

@@ -2740,29 +2740,34 @@ if __name__ == "__main__":
     # Start backend services if running in HF Spaces
     if is_hf_space:
         def start_mcp_server():
-            """Start MCP server in background thread."""
+            """Start MCP server in background process."""
             try:
-                import uvicorn
-                from backend.mcp_server import server
-                uvicorn.run(
-                    server.app,
-                    host="0.0.0.0",
-                    port=int(os.getenv("MCP_PORT", "8900")),
-                    log_level="info"
-                )
+                import sys
+                import subprocess
+                # Use subprocess.Popen to run in background
+                subprocess.Popen([
+                    sys.executable, "-m", "uvicorn",
+                    "backend.mcp_server.server:app",
+                    "--host", "0.0.0.0",
+                    "--port", os.getenv("MCP_PORT", "8900"),
+                    "--log-level", "info"
+                ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             except Exception as e:
                 print(f"Warning: Could not start MCP server: {e}")
         
         def start_fastapi_server():
-            """Start FastAPI server in background thread."""
+            """Start FastAPI server in background process."""
             try:
-                import uvicorn
-                uvicorn.run(
+                import sys
+                import subprocess
+                # Use subprocess.Popen to run in background
+                subprocess.Popen([
+                    sys.executable, "-m", "uvicorn",
                     "backend.api.main:app",
-                    host="0.0.0.0",
-                    port=int(os.getenv("API_PORT", "8000")),
-                    log_level="info"
-                )
+                    "--host", "0.0.0.0",
+                    "--port", os.getenv("API_PORT", "8000"),
+                    "--log-level", "info"
+                ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             except Exception as e:
                 print(f"Warning: Could not start FastAPI server: {e}")
         

requirements.txt

@@ -12,6 +12,7 @@ duckduckgo-search
 PyPDF2
 python-docx
 python-multipart
+websockets>=11.0
 gradio==4.20.0
 requests>=2.31.0
 plotly>=5.0.0