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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.
Post/Redirect/Get (PRG) is a web development design pattern that prevents some duplicate form submissions if the user clicks the refresh button after submitting the form, creating a more intuitive interface for user agents (users).
Starting with HTML 4.0, forms can also submit data in multipart/form-data as defined in RFC 2388 (See also RFC 1867 for an earlier experimental version defined as an extension to HTML 2.0 and mentioned in HTML 3.2). The special case of a POST to the same page that the form belongs to is known as a postback.
A redirect is a special type of page that sends the reader to another page. They are used when there are different names for the same subject. For example, the United Kingdom is often referred to as the "UK". The article on Wikipedia entitled UK is a redirect to the United Kingdom article, as it is the same topic as the United Kingdom article.
Double redirects are when a link on page A goes to redirect page B, which goes to redirect page C, which points to page D. In that case, when you click the link on page A, the Wikipedia software will display the redirect page C; which isn't what the reader needs. The link on page A or the redirect on page B needs to be changed.
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A page that is a redirect can be moved like any other page, although it is rarely useful because it has the same detrimental effect on page history as copy-pasting content to a new page, and making the old page a redirect: when moving a redirect page to a new page name, the redirect on the old page (now directing to the new redirect page) will ...
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