Web servers
So, it is about time that you learn what those famous web servers are. A web server is no more than a piece of software running on a machine and listening to requests from a specific port. Usually, this port is 80, but it can be any other that is available.
How they work
The following diagram represents the flow of request-response on the server side:
Request-response flow on the server side
The job of a web server is to route external requests to the correct application so that they can be processed. Once the application returns a response, the web server will send this response to the client. Let's take a close look at all the steps:
Get Learning PHP 7 now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
