How to do 301 redirects in Apache htaccess, IIS, PHP, ASP and ColdFusion
Establish proper search-friendly 301 redirects to manage duplicate content issues and changes to your site’s information architecture (URL structure) with the specific instructions for your server software below:
Apache Web Server .htaccess file
Apache .htaccess files let you override the Web server configuration on a per-directory hierarchial basis, and are instrumental in the creation of proper 301 redirects. For more information, consult the _Apache .htaccess Tutorial _ and the _Apache URL Rewriting Guide _.
Single Page Redirect:
Redirect 301 /old/url /new/url
or
Redirect Permanent /old/ur /new/url
Canonical Hostname Redirect (non-www to www):
This solution will redirect any page requested via a non-www domain to the same URL with the www domain, and as such it can be placed in the Document Root of your site and will be enforced globally:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^domain.com
RewriteRule (.*) http://www.domain.com/$1 [R=301,L]
Microsoft IIS Web Server
Note: these instructions require administrative access to IIS. If you do not have this access (e.g., if you have a shared hosting account on a Windows server), you should use one of the server-side scripting methods such as ASP or PHP given further below.
Single Page Redirect:
- Open Internet Services Manager and right-click on the file or folder you wish to redirect.
- Select the radio button “a redirection to a URL”.
- Enter the desitnation page for the redirect.
- Check “The exact url entered above” and the “A permanent redirection for this resource”.
- Hit “Apply”.
ColdFusion
Single Page Redirect:
Active Server Pages (ASP)
Single Page Redirect:
<% Response.Status=”301 Moved Permanently” Response.AddHeader=’Location’,’http://www.new-url.com/’ %>
Canonical Hostname Redirect (non-www to www):
This code should be inserted into a global include file or any ASP script which is executed for every page on the site before the page output begins:
<% 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(“REQUEST_URI”) Response.End End if %>
PHP 4 and PHP 5
Single Page Redirect:
header(‘HTTP/1.1 301 Moved Permanently’);
header(‘Location: http://www.new-url.com/’); ?>
Canonical Hostname Redirect (non-www to www):
<% 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”) Response.End End if %>
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