The semantics and structure of a Query String is defined in RFC 2396
Section 3.4 talks about the Query Component of a URI.

If you want to get a rock solid understanding of query strings read the specifications. Then you will have an easier time understanding how different applications use them.

W3C section on Naming and Addressing: URIs, URLs, ...

Get Strong Together!!

In reply to Re: What is a Query String in a URL by aardvark
in thread What is a Query String in a URL by Pyro3k

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