Server|server|Server header
X-Powered-By|x-powered-by|Backend technology
X-AspNet-Version|x-aspnet-version|ASP.NET version
X-AspNetMvc-Version|x-aspnetmvc-version|ASP.NET MVC version
X-Generator|x-generator|Generator
X-Drupal-Cache|x-drupal-cache|Drupal
X-Runtime|x-runtime|Ruby on Rails
Via|via|Proxy/CDN
X-Served-By|x-served-by|CDN/cache node
