gitlab

upstream gitlab {
  server                    172.17.42.1:50083;
}

# let gitlab deal with the redirection
server {
  listen                    80;
  server_name               git.example.com;
  server_tokens             off;
  root                      /dev/null;

  # Increase this if you want to upload larger attachments
  client_max_body_size      20m;

  # individual nginx logs for this vhost
  access_log                /var/log/nginx/gitlab_access.log;
  error_log                 /var/log/nginx/gitlab_error.log;

  location / {
    proxy_read_timeout      300;
    proxy_connect_timeout   300;
    proxy_redirect          off;

    proxy_set_header        X-Forwarded-Proto $scheme;
    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-Frame-Options   SAMEORIGIN;

    proxy_pass              http://gitlab;
  }
}

server {
  listen                    443   ssl spdy;
  server_name               git.example.com;
  server_tokens             off;
  root                      /dev/null;

  ## Increase this if you want to upload larger attachments
  client_max_body_size      20m;

  ## SSL
  ssl                       on;

  ## Individual nginx logs for this vhost
  access_log                /var/log/nginx/gitlab_ssl_access.log;
  error_log                 /var/log/nginx/gitlab_ssl_error.log;

  location / {
    ## If you use https make sure you disable gzip compression
    ## to be safe against BREACH attack.
    gzip                    off;

    proxy_read_timeout      300;
    proxy_connect_timeout   300;
    proxy_redirect          off;

    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-Proto   https;
    proxy_set_header        X-Frame-Options     SAMEORIGIN;

    proxy_pass http://gitlab;
  }
}

Using only the http conf, all I can get is a 500 bad gateway