“Dearest server, I am Chrome, the 64th of that name, child of WebKit, grandchild of KHTML, a disciple of Gecko, follower of the great Mozilla/5.0, running on Windows NT 10”— Amelia Bellamy-Royds, twitter.com
“Varnish can do a lot of things, but it's mostly known as a reverse HTTP proxy. It brands itself as an HTTP accelerator, making HTTP requests faster by caching them. It can also serve as a TCP load balancer (using pipe in the VCL code, more on that later), an HTTP load balancer or a generic reverse p…”— Mattias Geniar, ma.ttias.be
“An ETag (entity tag) is an HTTP response header returned by an HTTP/1.1 compliant web server used to determine change in content of a resource at a given URL. The value of the header is an opaque string representing the state of the resource at the time the response was generated.”— Microsoft Developer Network, msdn.microsoft.com
“A web cache (or HTTP cache) is an information technology for the temporary storage (caching) of web documents, such as HTML pages and images, to reduce bandwidth usage, server load, and perceived lag.”— Wikipedia, en.wikipedia.org