fix: final proxy tuning and log tailing

nginx.conf

@@ -22,11 +22,11 @@ http {
     keepalive_timeout  65;
 
     upstream streamlit {
-        server 127.0.0.1:8501;
+        server localhost:8501;
     }
 
     upstream fastapi {
-        server 127.0.0.1:8000;
+        server localhost:8000;
     }
 
     server {
@@ -76,12 +76,17 @@ http {
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
+            proxy_set_header X-Forwarded-Host $host;
             
             # WebSocket support for Streamlit
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection "upgrade";
             proxy_read_timeout 86400;
+            
+            # Prevent 502 if Streamlit is slow
+            proxy_connect_timeout 60s;
+            proxy_send_timeout 60s;
         }
     }
 }

scripts/start_space.sh

@@ -74,9 +74,12 @@ echo "$(date) - Final backend check before starting Streamlit..."
 curl -v http://127.0.0.1:8000/health || echo "FastAPI health check failed!"
 
 echo "$(date) - Starting Streamlit application on 0.0.0.0:8501..."
-export API_BASE_URL="http://127.0.0.1:8000"
+export API_BASE_URL="http://localhost:8000"
 streamlit run hopcroft_skill_classification_tool_competition/streamlit_app.py \
     --server.port 8501 \
     --server.address 0.0.0.0 \
     --server.enableCORS=false \
-    --server.enableXsrfProtection=false
+    --server.enableXsrfProtection=false &
+
+echo "$(date) - Process started. Tailing Nginx logs for debug..."
+tail -f /tmp/nginx_startup.log /tmp/fastapi.log