How to Setup a 301 Redirect in PHP, Apache, ASP

The “301 Permanent Redirect” is the most efficient and search engine friendly method for redirecting websites. You can use it in several situations, including:

• to redirect an old website to a new address

• to setup several domains pointing to one website

• to enforce only one version of your website (www. or no-www)

• to harmonize a URL structure change

 header("HTTP/1.1 301 Moved Permanently");

header("Location: http://www.newdomain.com/page.html");

exit();

?> 

if (substr($_SERVER['HTTP_HOST'],0,3) != 'www') {

header('HTTP/1.1 301 Moved Permanently');

header('Location: http://www.'.$_SERVER['HTTP_HOST']

.$_SERVER['REQUEST_URI']);

}

?>

RewriteEngine on

rewritecond %{http_host} ^domain.com [nc]

rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc] 

Response.Status="301 Moved Permanently"

Response.AddHeader='Location','http://www.new-url.com/'

%> 

If InStr(Request.ServerVariables("SERVER_NAME"),"www") = 0 Then

Response.Status="301 Moved Permanently"

Response.AddHeader "Location","http://www."

& Request.ServerVariables("HTTP_HOST")

& Request.ServerVariables("SCRIPT_NAME")

End if

%>

 I am going to describe several ways to setup 301 redirect, below i will cover the most used ones:

PHP Single Page Redirect:

In order to redirect a static page to a new address simply enter the code below inside the index.php file.

<?php




PHP Canonical Redirect:

The Canonical 301 Redirect will add (or remove) the www. prefixes to all the pages inside your domain. The code below redirects the visitors of the http://domain.com version to http://www.domain.com.

<?php




Apache .htaccess Singe Page Redirect:

In order to use this method you will need to create a file named .htaccess (not supported by Windows-based hosting) and place it on the root directory of your website, then just add the code below to the file.

Redirect 301 /old/oldpage.htm/new/http://www.domain.com/newpage.htm




Apache .htaccess Canonical Redirect:

Follow the same steps as before but insert the code below instead (it will redirect all the visitors accessing http://domain.com to http://www.domain.com)

Options +FollowSymlinks




ASP Single Page Redirect:

This redirect method is used with the Active Server Pages platform.

<%




ASP Canonical Redirect:

The Canonical Redirect with ASP must be located in a script that is executed in every page on the server before the page content starts.

<%