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#REDIRECT [[Query string]]
For dynamic [[webpage]]s, when value-keys are passed between a web client (usually a [[Web browser]]) and the server, this info can be passed through two methods. First, for [[HTTP]] GET requests, the [[URL]] used has a querystring appended to it that the web server, through naming conventions, separates and passes to the dynamic page. Secondly, for HTTP POST requests, value-key pairs are passed as separate parts of the HTTP request.
==Querystring format conventions==
The querystring and the regular components of the [[URL]] are separated by a [[question-mark]] ([[?]]). After that, pairs of key=value pairs follow, separated by the ampersand (&) character. Characters that are not valid parts of a request string are encoded into alternate forms (and usually decoded by the dynamic page) according to a static set of rules. An example URL with a querystring follows:
:''http://localhost/cart/example.php?lang=en&size=10&uid=50''
In this example, there are three keys:
*'''lang''', which has the value of '''en'''
*'''size''', which has the value of '''10'''
*'''uid''', which has the value of '''50'''
[[Category:URI scheme]]
[[Category:Internet standards]]
[[Category:Identifiers]]
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