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HTTP location - Wikipedia

From Wikipedia, the free encyclopedia

Instruction by web server containing the intended location of a web page.

The HTTP Location header field is returned in responses from an HTTP server under two circumstances:

1. To ask a web browser to load a different web page (URL redirection). In this circumstance, the Location header should be sent with an HTTP status code of 3xx. It is passed as part of the response by a web server when the requested URI has:
   • Moved temporarily;
   • Moved permanently; or
   • Processed a request, e.g. a POSTed form, and is providing the result of that request at a different URI
2. 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.^[1]

An obsolete version of the HTTP 1.1 specifications (IETF RFC 2616) required a complete absolute URI for redirection.^[2] The IETF HTTP working group found that the most popular web browsers tolerate the passing of a relative URL^[3] and, consequently, the updated HTTP 1.1 specifications (IETF RFC 7231) relaxed the original constraint, allowing the use of relative URLs in Location headers.^[4]

Absolute URLs are URLs that start with a scheme^[5] (e.g., http:, https:, telnet:, mailto:)^[6] and conform to scheme-specific syntax and semantics. For example, the HTTP scheme-specific syntax and semantics for HTTP URLs requires a "host" (web server address) and "absolute path", with optional components of "port" and "query".

A client requesting https://www.aungmyokyaw.com/index.html using

GET /index.html HTTP/1.1
Host: www.example.com

may get the server response

HTTP/1.1 302 Found
Location: https://www.example.org/index.php

Relative URLs are URLs that do not include a scheme or a host. In order to be understood they must be combined with the URL of the original request.

A client request for https://www.example.com/blog/all may get a server response with a path that is absolute because it starts with a slash:^[7]

HTTP/1.1 302 Found
Location: /articles/

The URL of the location is expanded by the client to https://www.example.com/articles/.^[8]

A client request for https://www.example.com/blog/latest may get a server response with a path that is relative because it doesn't start with a slash:^[7]

HTTP/1.1 302 Found
Location: 2020/zoo

The client removes the path segment after the last slash of the original URL and appends the relative path resulting in https://www.example.com/blog/2020/zoo.^[9][8]

• URL redirection
• Post/Redirect/Get

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