asp.net implement 301 redirect without www domain name to the domain name with www

Some friends may use the method of comparing benzene, add Response.redirectpermanent method under each Controller. The simpler approach is to add the following code to the Global.axax.cs:

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protected void Application_BeginRequest (object sender, EventArgs e) { String strurl = Request.Url.ToString (). Trim (). ToLower (); if (Strurl.contains ("Http://111cn.net")) { Response.redirectpermanent ("Http://www.111cn.net"); Not good } }

If you are serious, you will find that the wording is somewhat unfriendly, and the following wording is better:

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Response.redirectpermanent (Strurl.replace ("Http://111cn.net", "http://www.111cn.net"));

Good this article is very simple

Add 301 redirect instructions to the. htaccess file

The use of "mod_rewrite" technology, in the form of:

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Rewriteengine on Rewriterule ^ (. *) $ http://xxx.com/$1 [r=301,l]

1. redirect domain.com to www.domain.com

This redirect is designed to make the domain name unique, is the website SEO must do, the back redirects www.domain.com to domain.com is also for the same reason, but the form is different. Open the. htaccess file and add the following rules. (The following rule is for the primary domain name, and the subdomain is to be modified)

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Rewriteengine on Rewritecond%{http_host}!^www.domain.com$ [NC] Rewriterule ^ (. *) $ http://www.domain.com/$1 [l,r=301]

2. redirect www.domain.com to domain.com

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Rewriteengine on Rewritecond%{http_host}!^domain.com$ [NC] Rewriterule ^ (. *) $ http://domain.com/$1 [l,r=301]

3. REDIRECT olddomain.com to www.newdomain.com

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Rewriteengine on Rewritecond%{http_host}!olddomain.com$ [NC] Rewriterule ^ (. *) $ http://www.newdomain.com/$1 [l,r=301]

4. redirect olddomain.com to newdomain.com

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Rewriteengine on Rewritebase/ Rewritecond%{http_host}!olddomain.com$ [NC] Rewriterule ^ (. *) $ http://newdomain.com/$1 [l,r=301]

5. redirect domain.com/file/file.php to otherdomain.com/otherfile/other.php

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Rewritecond%{http_host} ^www.domain.com$ Rewriterule ^file/file.php$ http://www.otherdomain.com/otherfile/other.php [r=301,l]

Implement 301 redirects with asp/php:

Asp:

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Response.status= "Moved Permanently" Response.AddHeader "Location", "http:///" Response.End

Php:

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Header (" http/1.1 moved Permanently "); Header (" location:http:///"); Exit ();