nginx config for running jupyterhub behind a reverse proxy

jupyterhub.conf

server {
  listen 80;
  server_name subdomain.example.com;

  location / {
    proxy_pass http://localhost:1600;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
    proxy_redirect     default;
    #proxy_set_header   Host             $http_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-User $http_authorization;
    proxy_max_temp_file_size 0;

    #this is the maximum upload size
    client_max_body_size       20m;
    client_body_buffer_size    128k;

    proxy_connect_timeout      90;
    proxy_send_timeout         90;
    proxy_read_timeout         90;
    proxy_buffer_size          4k;
    proxy_buffers              4 32k;
    proxy_busy_buffers_size    64k;
    proxy_temp_file_write_size 64k;
  }
}