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Home Operating System CentOS

Apache 2 Redirects For “non-www” Sub-domains To “www”

How VPS by How VPS
October 1, 2019
in CentOS
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Contents

  1. Introduction
    1. Pre-requisites
    2. Setup to redirect “non-www” to “www”
      1. Method 1: Using a 301 redirect
      2. Method 2: Using a rewrite engine condition
    3. Setup to redirect “www” to “non-www”
      1. Method 1: Using a 301 redirect
      2. Method 2: Using a rewrite engine condition
  2. Want to contribute?


Introduction

When you visit https://vultr.com, you’ll notice it automatically forwards you to its “www” subdomain http://www.vultr.com. This writeup shows you how to setup Apache 2 to redirect a non-www sub-domain to a “www” one, and vice-versa.

Pre-requisites

  • You have a Vultr Linux instance running Apache 2.
  • Your have domain name (e.g example.com) whose DNS A records for “@” and “www” are pointing to the IP of your Vultr machine above.

Setup to redirect “non-www” to “www”

Method 1: Using a 301 redirect

Setup two virtual hosts, one for the “non-www” sub-domain and the other for “www”

<VirtualHost *:80>
    ServerName example.com
    Redirect 301 / http://www.example.com/
</VirtualHost>

<VirtualHost *:80>
    ServerName www.example.com

    #other vhost settings go here (e.g. logs, site root)
</VirtualHost>
Method 2: Using a rewrite engine condition

Put below snippet in a .htaccess file in your site’s root folder. Note that Apache’s mod_rewrite module has to be enabled for you to use this method. You can enable it by running sudo a2enmod rewrite.

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} !^www/. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

Setup to redirect “www” to “non-www”

Method 1: Using a 301 redirect

Setup two virtual hosts, one for the “www” sub-domain and the other for “non-www”

<VirtualHost *:80>
    ServerName www.example.com
    Redirect 301 / http://example.com/
</VirtualHost>

<VirtualHost *:80>
    ServerName example.com

    #other vhost settings go here (e.g. logs, site root)
</VirtualHost>
Method 2: Using a rewrite engine condition

Put below snippet in a .htaccess file in your site’s root folder. Note that Apache’s mod_rewrite module has to be enabled for you to use this method. You can enable it by running sudo a2enmod rewrite.

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www/.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

Written by Lami Adabonyan

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