Configuring nginx as a Jenkins proxy with SSL

jenkins.conf

upstream app_server {
  server 127.0.0.1:8080 fail_timeout=0;
}

server {
  listen 80 default;
  rewrite ^ https://$host$request_uri? permanent;
}

server {
  listen 443;
  listen [::]:443 default ipv6only=on;

  ssl on;
  ssl_certificate /etc/nginx/ssl/jenkins.pem;
  ssl_certificate_key /etc/nginx/ssl/jenkins.key;

  server_name $hostname;

  location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Host $http_host;
    proxy_redirect http:// https://;
    proxy_connect_timeout   150;
    proxy_send_timeout      100;
    proxy_read_timeout      100;
    proxy_buffers           4 32k;
    client_max_body_size    8m;
    client_body_buffer_size 128k;

    if (!-f $request_filename) {
      proxy_pass http://app_server;
      break;
    }
  }
}