Run via uvicorn FastAPI+Gradio so /chat stays up for Flutter.

README.md

@@ -13,16 +13,17 @@ pinned: false
 
 Gradio Space that proxies chat to DeepSeek with per-topic personality prompts.
 
-## App endpoints (used by Flutter)
+## Endpoints (Flutter)
 
 - `GET /health`
 - `GET /personalities`
 - `GET /personalities/{id}`
 - `POST /chat` — `{ "personalityId", "message", "history?" }`
+- UI: `/ui`
 
 Public URL: `https://scchess-confidence-api.hf.space`
 
 ## Secrets
 
 - `DEEPSEEK_API_KEY` (required)
-- `CHAT_API_SECRET` (optional) — if set, non-health routes need header `X-App-Key`
+- `CHAT_API_SECRET` (optional) — non-health API routes need header `X-App-Key`

app.py

@@ -9,12 +9,12 @@ from typing import Any
 
 import gradio as gr
 import httpx
-from fastapi import HTTPException, Request
-from fastapi.responses import JSONResponse
+from fastapi import FastAPI, HTTPException, Request
+from fastapi.responses import JSONResponse, RedirectResponse
 
 try:
     import spaces
-except ImportError:  # local runs without ZeroGPU
+except ImportError:
     spaces = None
 
 PERSONALITIES_PATH = Path(__file__).with_name("personalities.json")
@@ -130,13 +130,7 @@ async def deepseek_chat(
     }
 
 
-PERSONALITY_CHOICES = [
-    (f"{p['name']} ({p['id']})", p["id"]) for p in PERSONALITIES.values()
-]
-
-
-# ZeroGPU Spaces require at least one @spaces.GPU function at import time.
-# Chat itself is CPU-only (DeepSeek HTTP proxy); this satisfies the runtime check.
+# ZeroGPU hardware on this Space requires a @spaces.GPU symbol at import time.
 if spaces is not None:
 
     @spaces.GPU(duration=60)
@@ -144,6 +138,11 @@ if spaces is not None:
         return "ok"
 
 
+PERSONALITY_CHOICES = [
+    (f"{p['name']} ({p['id']})", p["id"]) for p in PERSONALITIES.values()
+]
+
+
 async def ui_chat(
     personality_id: str,
     message: str,
@@ -163,28 +162,13 @@ async def ui_chat(
     return history, ""
 
 
-with gr.Blocks(title="Confidence Buddy API") as demo:
-    gr.Markdown(
-        "## Confidence Buddy API\n"
-        "Flutter uses `POST /chat`. This UI is for quick manual checks.\n\n"
-        f"Personalities loaded: **{len(PERSONALITIES)}**"
-    )
-    personality = gr.Dropdown(
-        choices=PERSONALITY_CHOICES,
-        value=PERSONALITY_CHOICES[0][1] if PERSONALITY_CHOICES else None,
-        label="Personality",
-    )
-    chatbot = gr.Chatbot(type="messages", height=420)
-    msg = gr.Textbox(label="Message", placeholder="Type a message…")
-    clear = gr.Button("Clear")
-    msg.submit(ui_chat, [personality, msg, chatbot], [chatbot, msg])
-    clear.click(lambda: ([], ""), outputs=[chatbot, msg])
+api = FastAPI()
 
 
-# Flutter-compatible REST routes on the Gradio FastAPI app (Spaces launches `demo`).
-@demo.app.middleware("http")
+@api.middleware("http")
 async def optional_app_key(request: Request, call_next):
-    if request.url.path == "/health":
+    path = request.url.path
+    if path in ("/health", "/", "/ui", "/ui/") or path.startswith("/ui/"):
         return await call_next(request)
     secret = _app_secret()
     if secret and request.headers.get("x-app-key") != secret:
@@ -192,17 +176,22 @@ async def optional_app_key(request: Request, call_next):
     return await call_next(request)
 
 
-@demo.app.get("/health")
+@api.get("/")
+async def root():
+    return RedirectResponse(url="/ui/")
+
+
+@api.get("/health")
 async def health():
     return {"ok": True, "hasApiKey": bool(_api_key())}
 
 
-@demo.app.get("/personalities")
+@api.get("/personalities")
 async def personalities_list():
     return list_personalities()
 
 
-@demo.app.get("/personalities/{personality_id}")
+@api.get("/personalities/{personality_id}")
 async def personality_detail(personality_id: str):
     personality = get_personality(personality_id)
     if not personality:
@@ -217,7 +206,7 @@ async def personality_detail(personality_id: str):
     }
 
 
-@demo.app.post("/chat")
+@api.post("/chat")
 async def chat_endpoint(request: Request):
     body = await request.json()
     try:
@@ -228,3 +217,31 @@ async def chat_endpoint(request: Request):
         )
     except HTTPException as exc:
         return JSONResponse({"error": exc.detail}, status_code=exc.status_code)
+
+
+with gr.Blocks(title="Confidence Buddy API") as gradio_ui:
+    gr.Markdown(
+        "## Confidence Buddy API\n"
+        "Flutter uses `POST /chat`. This UI is for quick manual checks.\n\n"
+        f"Personalities loaded: **{len(PERSONALITIES)}** · "
+        f"API key configured: **{bool(_api_key())}**"
+    )
+    personality = gr.Dropdown(
+        choices=PERSONALITY_CHOICES,
+        value=PERSONALITY_CHOICES[0][1] if PERSONALITY_CHOICES else None,
+        label="Personality",
+    )
+    chatbot = gr.Chatbot(type="messages", height=420)
+    msg = gr.Textbox(label="Message", placeholder="Type a message…")
+    clear = gr.Button("Clear")
+    msg.submit(ui_chat, [personality, msg, chatbot], [chatbot, msg])
+    clear.click(lambda: ([], ""), outputs=[chatbot, msg])
+
+
+app = gr.mount_gradio_app(api, gradio_ui, path="/ui")
+
+
+if __name__ == "__main__":
+    import uvicorn
+
+    uvicorn.run(app, host="0.0.0.0", port=int(os.environ.get("PORT", "7860")))

requirements.txt

@@ -1,3 +1,4 @@
 gradio>=5.0.0,<6
 httpx>=0.27.0
 spaces>=0.30.0
+uvicorn>=0.30.0