Fix port binding crash: kill zombie process and enable SO_REUSEADDR

web/app.py

@@ -885,8 +885,23 @@ async def get_results(sid: str):
 
 if __name__ == "__main__":
     import uvicorn
+    import socket
+
     port = int(os.getenv("PORT", "7860" if IS_SPACES else "8000"))
     host = "0.0.0.0" if IS_SPACES else "127.0.0.1"
+
+    # Kill any process holding the port (HF Spaces restarts can leave zombies)
+    if IS_SPACES:
+        import subprocess
+        subprocess.run(f"fuser -k {port}/tcp", shell=True, capture_output=True)
+
     print(f"\n  SGO Web Interface")
     print(f"  http://{host}:{port}\n")
-    uvicorn.run(app, host=host, port=port, access_log=False)
+
+    config = uvicorn.Config(app, host=host, port=port, access_log=False)
+    server = uvicorn.Server(config)
+    # Enable SO_REUSEADDR so restarts don't fail on TIME_WAIT sockets
+    config.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    config.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    config.socket.bind((host, port))
+    server.run()