fix(space): mount Gradio at / for HF iframe; disable SSR; curl path + blank UI notes; example step JSON

README.md

@@ -49,7 +49,7 @@ suggested_hardware: cpu-basic
 
 ### OpenEnv HTTP API on the Hugging Face Space
 
-The Space runs the same FastAPI routes as [`api_server.py`](api_server.py) on the **app root** (Gradio UI is at **`/ui`**; `/` redirects to `/ui`). There is **no `/start`** endpoint — begin an episode with **`POST /reset`**, then drive it with **`POST /step`**.
+The Space runs the same FastAPI routes as [`api_server.py`](api_server.py) on the **app root**, with **Gradio at `/`** (same host as `/health`, `/reset`, `/step`, `/state`). There is **no `/start`** endpoint — begin an episode with **`POST /reset`**, then drive it with **`POST /step`**.
 
 1. **Base URL:** open the live Space, then use the **`*.hf.space`** host shown in the address bar (for this project it is typically **`https://sanjay7676-team404-forge.hf.space`**). If yours differs, copy it from the running app or from the Space **Embed** snippet.
 2. **Check liveness:** `curl -sS "https://sanjay7676-team404-forge.hf.space/health"`
@@ -64,6 +64,12 @@ curl -sS -X POST "https://sanjay7676-team404-forge.hf.space/step" \
 
 5. **Observe state:** `curl -sS "https://sanjay7676-team404-forge.hf.space/state"`
 
+**Windows `curl` + `@step.json`:** `curl` resolves the file **relative to your current directory**. Either `cd` into the folder that contains `step.json`, or pass a full path, for example:
+
+`curl.exe ... --data-binary "@examples/space_step.json"` (from repo root) or any **absolute** path to your JSON file.
+
+**If the Hub “App” tab is blank:** open the **direct** Space URL in a new tab — `https://sanjay7676-team404-forge.hf.space/` (Gradio UI should load there). Allow third-party cookies for `huggingface.co` if the embedded App tab stays empty ([HF discussion](https://discuss.huggingface.co/t/cant-able-to-see-ui-when-the-model-is-running/56373)).
+
 **Note:** The Space shares **one** in-memory environment across all visitors — concurrent `reset` / `step` calls can interleave. For isolated runs, use **Docker** or **local** `api_server.py` on port `8000`.
 
 ### NOTE 1 — Non‑negotiable submission requirements (checklist)

app.py

@@ -4,7 +4,6 @@ import gradio as gr
 import pandas as pd
 from typing import Any, Dict
 from fastapi import FastAPI
-from fastapi.responses import RedirectResponse
 
 from trainer import run_benchmark_mode, run_compare_mode
 from memory import CoachMemory
@@ -162,7 +161,7 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
     with gr.Tab("3. API Endpoints"):
         gr.Markdown("""
         ### OpenEnv API Standard
-        FORGE-v4 exposes a FastAPI server on the **same origin** as this UI: routes live at the **site root**, while Gradio is under **`/ui`**. Locally, `python api_server.py` serves on **`:8000`**; on this Space, use your **`*.hf.space`** base URL (no separate `/start` — use **`POST /reset`** then **`POST /step`**).
+        FORGE-v4 serves **Gradio at `/`** and the OpenEnv JSON routes at the **same origin** (`/health`, `/reset`, `/step`, `/state`). Locally, `python api_server.py` serves **API-only** on **`:8000`**; `python app.py` serves UI **+** API on **`:7860`**. On this Space, use your **`*.hf.space`** base URL (no `/start` — use **`POST /reset`** then **`POST /step`**).
 
         - **`GET /health`**: Liveness / version check.
         - **`POST /reset`**: Starts a new episode and returns the initial state.
@@ -185,15 +184,15 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
         outputs=[m_pass, m_def_reward, m_adv_reward, m_tier, plot_reward, plot_pass, memory_output],
     )
 
-space_app = gr.mount_gradio_app(api_app, demo, path="/ui")
-
-
-@space_app.get("/")
-async def root_redirect() -> RedirectResponse:
-    return RedirectResponse(url="/ui", status_code=302)
-
-
-app = space_app
+# Mount Gradio at "/" so Hugging Face Spaces (hub iframe + *.hf.space) load assets and
+# websockets from the same root. OpenEnv routes on api_app are registered before this mount
+# and keep precedence over the Gradio catch-all.
+app = gr.mount_gradio_app(
+    api_app,
+    demo,
+    path="/",
+    ssr_mode=False,
+)
 
 
 if __name__ == "__main__":

examples/space_step.json

@@ -0,0 +1 @@
+{"coder_code": "def solution(arr):\n    return sorted(list(arr))", "coder_version": "demo"}