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That is not to say that every web form should specify method="post" in its opening tag. Many forms are used to specify more precisely the retrieval of information from the server, without any intention of altering the main database. Search forms, for example, are ideally suited to having method="get" specified. [4] There are times when HTTP GET ...
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Diagram of a double POST problem encountered in user agents. Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.
The GET method requests that the target resource transfer a representation of its state. GET requests should only retrieve data and should have no other effect. (This is also true of some other HTTP methods.) [1] For retrieving resources without making changes, GET is preferred over POST, as they can be addressed through a URL.
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In web development, a postback is the exchange of information between servers to report a user's action on a website, network, or app. Technically speaking, a postback is an HTTP POST to the same page that the form is on. In other words, the contents of the form are POSTed back to the same URL as the form. [1]
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