HTTP - Redirect (status codes 3xx) - Client must take additional action

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1 - About

The HTTP 3xx class of status code indicates that the client (user or user agent) must take additional action to complete the request.

A user agent may automatically redirect a request.

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3 - List

3.1 - 300 - Multiple Choices

The client is shown with a multiple choice.

For example, the client must choose between:

  • multiple video format options,
  • different files with different extensions,
  • different word sense disambiguation.

3.2 - 301 - Moved Permanently

This and all future requests should be directed to the given URI.

3.3 - 302 - Found

With HTTP/1.0 specification:

  • the client must perform a temporary redirect (the original describing phrase was “Moved Temporarily”), but popular browsers implemented 302 with the functionality of a 303

Therefore, HTTP/1.1

  • added the status codes 303 and 307 to distinguish between the two behaviors. 302 is then superseded by 303 and 307 in HTTP/1.1 but preserved for backward compatibility.
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3.4 - 303 - See Other URI

Since HTTP/1.1, a 303 will always end by a GET request to the new URL from the client.

When a 303 is received in response to :

  • a GET method, the response to the request can be found under another URI
  • a POST (or PUT/DELETE), the client should presume that the server has received the data and should issue a redirect with a separate GET message.

3.5 - 307 - Temporary redirect

provides a new URL for the browser to resubmit a GET or POST request.

3.6 - 308 - Permanent redirect

provides a new URL for the browser to resubmit a GET or POST request.

4 - Example

4.1 - Permanent Redirect with htaccess

.htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^(.*)$ https://gerardnico.com/$1 [R=301,L]
</IfModule>

5 - Documentation / Reference

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web/http/redirect.txt · Last modified: 2019/05/11 21:28 by gerardnico