map $http_upgrade $proxy_connection {
    default "rpc_backend${RPC_PATH}";
    websocket "ws_backend${WS_PATH}";
}

map $http_upgrade $is_websocket {
    default 0;
    websocket 1;
}

server {
    listen 80;
    server_name _;

    location / {
        proxy_pass http://$proxy_connection;
        proxy_http_version 1.1;         # Override default HTTP/1.0
        proxy_set_header Host localhost;
        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 Upgrade $http_upgrade;  # Forward Upgrade header
        proxy_set_header Connection $http_connection;  # Forward Connection header

        proxy_connect_timeout 60s;

        # Disable buffering for real-time traffic
        proxy_buffering off;

        #set $proxy_read_timeout 3600s;
        #set $proxy_send_timeout 3600s;

        # If it's a websocket, change timeouts
        #if ($is_websocket) {
        #    set $proxy_read_timeout 3600s;
        #    set $proxy_send_timeout 3600s;
        #}

        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
    }
}

upstream rpc_backend {
    server ${PROXY_HOST}:${RPC_PORT};
}

upstream ws_backend {
    server ${PROXY_HOST}:${WS_PORT};
}