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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. When a web form is submitted to a server through an HTTP POST request, attempts to refresh the server response can cause the contents of ...
A webform, web form or HTML form on a web page allows a user to enter data that is sent to a server for processing. Forms can resemble paper or database forms because web users fill out the forms using checkboxes , radio buttons , or text fields .
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.
The server then refreshes the same page using the information it has just received. Postbacks are most commonly discussed in relation to JSF and ASP or ASP.NET. In ASP, a form and its POST action have to be created as two separate pages, resulting in the need for an intermediate page and a redirect if one simply wants to perform a postback.
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An early use of CGI scripts was to process forms. In the beginning of HTML, HTML forms typically had an "action" attribute and a button designated as the "submit" button. When the submit button is pushed the URI specified in the "action" attribute would be sent to the server with the data from the form sent as a query string.
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