nginx.conf

user root;

worker_processes auto;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    sendfile on;
    keepalive_timeout 65;
    
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    'rt=$request_time uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time"';
    
    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log debug;

    upstream backend {
        server 127.0.0.1:8000;
        keepalive 32;
    }

    upstream frontend {
        server 127.0.0.1:8501;
        keepalive 32;
    }

    server {
        listen 8080 default_server;
        server_name _;
        client_max_body_size 100M;

        # API endpoints (more specific route first)
        location ^~ /api/ {  # Add ^~ to give this location higher priority
            proxy_pass http://backend/;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            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 Connection "";
            
            # Add debug headers
            add_header X-Debug-Path $request_uri;
            add_header X-Debug-URI $uri;
            
            # Better error handling
            proxy_intercept_errors on;
            error_page 404 = @notfound;
        }

        # Health check endpoint
        location = /health {
            proxy_pass http://backend/health;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            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;
        }

        # Streamlit static files
        location /_stcore/ {
            proxy_pass http://frontend/_stcore/;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
            proxy_buffering off;
        }

        # All other requests go to frontend
        location / {
            proxy_pass http://frontend;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $host;
            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_buffering off;
        }

        # 404 handler
        location @notfound {
            return 404 '{"error": "Not Found"}';
            add_header Content-Type application/json;
        }
    }
}