nginx reverse proxy configuration for socket i.o

nginx_reverse_proxy_socket_io.sh

location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                # try_files $uri $uri/ =404;

                proxy_pass http://127.0.0.1:8080/;
                chunked_transfer_encoding off;
                proxy_buffering   off;
                proxy_set_header Upgrade $http_upgrade;    // 핸드셰이크 업그레이드
                proxy_set_header Connection "upgrade";
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-Real-IP $remote_addr;  # This line.
                proxy_set_header Host $host;
                proxy_http_version 1.1;
        }

        location /socket.io/ {
                proxy_pass http://localhost:5002/socket.io/;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;    // 핸드셰이크 업그레이드
                proxy_set_header Connection "upgrade";
               proxy_redirect off;

                proxy_buffers 8 32k;
                proxy_buffer_size 64k;

                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $http_host;
                proxy_set_header X-NginX-Proxy true;

        }