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Often the result of too much data being encoded as a query-string of a GET request, in which case it should be converted to a POST request. Called "Request-URI Too Long" previously. [16]: §10.4.15 415 Unsupported Media Type The request entity has a media type which the server or resource does not support.
Caching Behavior: Many web browsers cache 301 redirects. This means that once a user's browser encounters a 301 redirect, subsequent requests to the original URL will be automatically directed to the new URL without contacting the server. Updating Bookmarks: Browsers may update bookmarks to reflect the new URL after encountering a 301 redirect.
One thing the most visited websites have in common is that they are dynamic websites.Their development typically involves server-side coding, client-side coding and database technology.
Date: The date and time at which the message was originated (in "HTTP-date" format as defined by RFC 9110: HTTP Semantics, section 5.6.7 "Date/Time Formats"). Date: Tue, 15 Nov 1994 08:12:31 GMT: Permanent RFC 9110: Expect: Indicates that particular server behaviors are required by the client. Expect: 100-continue: Permanent RFC 9110: Forwarded
When data that has been entered into HTML forms is submitted, the form field names and values are encoded and sent to the server in an HTTP request message using method GET or POST, or, historically, via email. [4]
Processed a request, e.g. a POSTed form, and is providing the result of that request at a different URI To provide information about the location of a newly created resource. In this circumstance, the Location header should be sent with an HTTP status code of 201 or 202 .
Percent decoding may accidentally be performed multiple times; once before validation, but again afterwards, making the application vulnerable to Double percent-encoding attacks [6] in which illegal characters are replaced by their double-percent-encoded form in order to bypass security countermeasures. [7]
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.