The “301 Permanent Redirect” is the most efficient and search engine friendly method for redirecting websites. While these is a good search engine optimization factor, you can use it in several situations, including:

• redirecting 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

There are several ways to setup a 301 Redirect, below I will cover the most used ones:

PHP Single Page Redirection

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

 

<?php
header(“HTTP/1.1 301 Moved Permanently”);
header(“Location: http://www.newdomain.com/page.html”);
exit();
?>

 

PHP Canonical Redirecting

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
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’]);
}
?>

 

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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 Redirection

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

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^domain.com [nc]
rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc]

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ASP Single Page Redirect

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

 

<%
Response.Status=”301 Moved Permanently”
Response.AddHeader=’Location’,’http://www.new-url.com/’
%>

 

ASP Canonical Redirect

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

<%
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
%>

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