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Table 4-1

301

The 301 status code indicates that a resource has been permanently moved to the new location specified

by the

Location:

header that follows. It indicates that the old URL is obsolete and should replace any

references to the old URL with the indicated URL.

Take as an example a fictional page named

http://www.example.com/old_page.php

, which returns

this header:

HTTP/1.1 301 Moved Permanently

Date: Wed, 14 Jun 2006 09:50:39 GMT

Server: Apache/2.0.54 (Unix)

X-Powered-By: PHP/5.0.4

Location: http://www.example.com/new_page.php

Content-Length: 0

Connection: close

Content-Type: text/html; charset=utf-8

When loading the page in a web browser, the response will be automatically redirected to the new loca-

tion specified by the

Location

header. After the redirection, the back button in your browser won’t ref-

erence the initially requested page, as a result of the old page being

permanently

redirected.

The 301 status code also indicates to search engines that link equity from the previous URL should be

credited to the new one. In theory, the new page will inherit the rankings of the original page. In prac-

tice, however, it may take some time for this to occur. It would be wise not to frivolously change URLs

regardless, if this is a concern.

Status Code

Description

300

Multiple choices

301

Moved permanently

302

Found

303

See other

304

Not modified

305

Use Proxy

307

Temporary Redirect

81

Chapter 4: Content Relocation and HTTP Status Codes

c04.qxd:c04 10:40 81

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