Fix 403 error: Unify deployment on port 7860 using FastAPI reverse proxy for Streamlit

backend/main.py

@@ -9,6 +9,9 @@ from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 from contextlib import asynccontextmanager
 from infra.logger import get_logger
+import httpx
+from fastapi import Request
+from fastapi.responses import StreamingResponse
 
 log = get_logger(__name__)
 WEB_DIR = Path(__file__).resolve().parent.parent / "frontend" / "web"
@@ -162,6 +165,44 @@ def health_check():
     return {"status": "ok", "version": "4.0.0"}
 
 
+# ── Streamlit Reverse Proxy ──────────────────────────────────────────────────
+# This catch-all route forwards any non-API requests to the Streamlit port (8001).
+STREAMLIT_URL = "http://localhost:8001"
+
+@app.api_route("/{path_name:path}", include_in_schema=False)
+async def _proxy_to_streamlit(request: Request, path_name: str):
+    # Skip if the path is explicitly an API route (though FastAPI should have caught it)
+    if path_name.startswith("api/") or path_name.startswith("docs") or path_name.startswith("redoc") or path_name.startswith("openapi.json"):
+        return {"error": "Not Found"}
+
+    target_url = f"{STREAMLIT_URL}/{path_name}"
+    if request.query_params:
+        target_url += f"?{request.query_params}"
+
+    async with httpx.AsyncClient() as client:
+        # Standard proxy logic
+        method = request.method
+        headers = dict(request.headers)
+        # We must remove host and adjust for the internal service
+        headers.pop("host", None)
+        
+        # Handle Streamlit's specific requirements (like websockets if needed, but simple HTTP first)
+        response = await client.request(
+            method,
+            target_url,
+            content=await request.body(),
+            headers=headers,
+            timeout=60.0,
+            follow_redirects=True,
+        )
+
+        return StreamingResponse(
+            response.aiter_bytes(),
+            status_code=response.status_code,
+            headers=dict(response.headers),
+        )
+
+
 if __name__ == "__main__":
     try:
         import uvicorn

frontend/pages/1_Home.py

@@ -9,7 +9,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 st.set_page_config(page_title="Home - AutoML Studio", page_icon="🏠", layout="wide")
 

frontend/pages/2_Dataset_DNA.py

@@ -10,7 +10,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 st.set_page_config(page_title="Dataset DNA", page_icon="🧬", layout="wide")
 

frontend/pages/3_Training_Lab.py

@@ -10,7 +10,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 st.set_page_config(page_title="Live Training & Results", page_icon="⚡", layout="wide")
 

frontend/pages/4_Results_Console.py

@@ -14,7 +14,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 st.set_page_config(page_title="Results Console - AutoML Studio", page_icon="📊", layout="wide")
 

frontend/pages/5_Experiment_Tracker.py

@@ -9,7 +9,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 
 def api_json(path: str, timeout: int = 10):

frontend/pages/6_Drift_Monitor.py

@@ -9,7 +9,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 st.set_page_config(page_title="Drift Monitor", page_icon="📉", layout="wide")
 

frontend/pages/7_Smart_AI_Hub.py

@@ -10,7 +10,7 @@ from ui_shell import (
     render_workspace_banner,
 )
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 st.set_page_config(page_title="Smart AI Hub - AutoML Studio", page_icon="🤖", layout="wide")
 

frontend/ui_shell.py

@@ -4,7 +4,7 @@ from typing import Iterable, Optional
 import requests
 import streamlit as st
 
-API_URL = "http://localhost:8000/api"
+API_URL = "http://localhost:7860/api"
 
 SESSION_DEFAULTS = {
     "dataset_id": None,

requirements.txt

@@ -30,6 +30,7 @@ Pillow>=10.3.0
 # ── Async / Background Jobs ─────────────────────────────
 celery==5.4.0
 redis==5.0.4
+httpx>=0.27.0
 
 # ── Database ────────────────────────────────────────────
 sqlalchemy==2.0.30

start.sh

@@ -15,22 +15,23 @@ echo "Starting Redis..."
 redis-server --port 6379 --dir /tmp --dbfilename dump.rdb --daemonize no &
 REDIS_PID=$!
 
-# 2. Start FastAPI Backend (Internal API)
-echo "Starting FastAPI Backend..."
+# 2. Start FastAPI Backend (Public Gateway)
+echo "Starting FastAPI Backend on port ${PORT:-7860}..."
 cd "$SCRIPT_DIR/backend"
-python -m uvicorn main:app --host 0.0.0.0 --port 8000 --timeout-keep-alive 600 &
+python -m uvicorn main:app --host 0.0.0.0 --port "${PORT:-7860}" --timeout-keep-alive 600 &
 BACKEND_PID=$!
 
 # 3. Start Celery Worker (Task Processor)
 echo "Starting Celery Worker..."
-# We run this from the backend directory where core.worker is accessible
+cd "$SCRIPT_DIR/backend"
 python -m celery -A core.worker.celery_app worker --loglevel=info --concurrency=1 &
 WORKER_PID=$!
 
-# 4. Start Streamlit Frontend (Public UI)
-echo "Starting Streamlit Frontend on port ${PORT:-7860}..."
+# 4. Start Streamlit Frontend (Internal Service)
+# This port (8001) will be proxied by FastAPI.
+echo "Starting Streamlit Frontend on internal port 8001..."
 cd "$SCRIPT_DIR/frontend"
-python -m streamlit run app.py --server.port "${PORT:-7860}" --server.headless true --server.address 0.0.0.0 &
+python -m streamlit run app.py --server.port 8001 --server.headless true --server.address 127.0.0.1 &
 FRONTEND_PID=$!
 
 echo "🚀 All services launched!"