server {
    listen 7860;
    server_name _;
    
    client_max_body_size 50M;
    
    # Main API routes
    location /api/ {
        proxy_pass http://localhost:3001;
        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_read_timeout 300s;
        proxy_connect_timeout 75s;
    }
    
    # SSE streaming endpoint - disable buffering
    location ~ ^/api/sandbox/[^/]+/command/[^/]+/stream$ {
        proxy_pass http://localhost:3001;
        proxy_http_version 1.1;
        proxy_set_header Connection '';
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 3600s;
        chunked_transfer_encoding off;
    }
    
    # Dynamic port preview - proxy to internal ports
    location ~ ^/preview/(d+)/(.*)$ {
        proxy_pass http://localhost:$1/$2$is_args$args;
        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_read_timeout 300s;
    }
    
    # Health check
    location /health {
        proxy_pass http://localhost:3001/health;
    }
    
    # Root
    location / {
        proxy_pass http://localhost:3001/;
    }
}