fix: inject wsproto as uvicorn WebSocket backend, bypass broken websockets legacy

app.py

@@ -342,4 +342,18 @@ with gr.Blocks(title="Cloth Swap", theme=gr.themes.Soft()) as demo:
         outputs=[gate, main_app, error_msg],
     )
 
+# The HF base image ships websockets v13+ which removed the legacy API that
+# the installed uvicorn version uses. Redirect uvicorn's WebSocket backend to
+# wsproto before demo.launch() triggers the import of uvicorn.protocols.websockets.auto.
+import sys as _sys
+from types import ModuleType as _ModuleType
+_ws_auto = _ModuleType("uvicorn.protocols.websockets.auto")
+_sys.modules["uvicorn.protocols.websockets.auto"] = _ws_auto
+try:
+    from uvicorn.protocols.websockets.wsproto_impl import WSProtocol as _WSP
+    _ws_auto.AutoWebSocketsProtocol = _WSP
+    print("uvicorn → wsproto WebSocket backend active")
+except Exception as _e:
+    print(f"WARNING: wsproto backend setup failed: {_e}")
+
 demo.launch(show_error=True)

requirements.txt

@@ -1,4 +1,4 @@
 requests
 Pillow
 python-dotenv
-uvicorn>=0.30.0
+wsproto