proxy.conf

user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
    worker_connections 1024;
}
http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    log_format main  '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    access_log /var/log/nginx/access.log  main;
    sendfile on;
    keepalive_timeout 65;
    gzip on;
    gzip_comp_level 2;
    gzip_buffers 16 8k;
    gzip_proxied any;
    gzip_min_length 1000;
    gzip_types *;
    server {
      location /socket.io/ {
        proxy_pass 'http://whiteboard.server:8715';
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
      }
      location / {
        proxy_pass http://whiteboard.client:80;
      }
    }
}