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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] Postbacks are commonly seen in edit forms, where the user introduces information in a form and hits "save" or "submit", causing a postback.
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.
Essentially, a pingback is an XML-RPC request (not to be confused with an ICMP ping) sent from Site A to Site B, when an author of the blog at Site A writes a post that links to Site B. The request includes the URI of the linking page. When Site B receives the notification signal, it automatically goes back to Site A checking for the existence ...
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or retrieving and parsing the given URL; Retrieve page at "linking post URL" Parse retrieved page for desired information; Verifying that linking page does indeed link to linked page is recommended, not explicitly required Advantages Requires no special code on linking server (the link itself becomes the notification when someone clicks on it)
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A user might mistype a URL. Organizations often register these misspelled domains and redirect them to the intended location. This technique is often used to "reserve" other top-level domains (TLD) with the same name, or make it easier for a ".edu" or ".net" site to accommodate users who type ".com".
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