Published at LXer:
When you think about what a Web server does at a high level, it receives HTTP requests and returns HTTP responses. In a perfect world, the server would return a response immediately without having to do any real work. In the real world, however, the server may have to do quite a bit of work before returning a response to the client. Let's first look at how a typical Web server handles this, and then see what Varnish does to improve the situation.
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