Redirect non-www to www in .htaccess

Question

I have this in my .htaccess file:

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

but whenever I access a file on my root like http://example.com/robots.txt it will redirect to http://www.example.comrobots.txt/.

How can I correct this so that it will redirect correctly to http://www.example.com/robots.txt?

Answer 1

This configuration worked for me in bitnami wordpress with SSL configured :

Added the below under "RewriteEngine On" in file /opt/bitnami/apps/wordpress/conf/httpd-app.conf

RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^ http%{ENV:protossl}://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteBase /
RewriteCond %{HTTPS} !on
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Answer 2

Here's the correct solution which supports https and http:

# Redirect to www
RewriteCond %{HTTP_HOST} ^[^.]+\.[^.]+$
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Answer 3

If possible, add this to the main Apache configuration file. It is a lighter-weight solution, less processing required.

<VirtualHost 64.65.66.67>
        ServerName example.com
        Redirect permanent / http://www.example.com/
</VirtualHost>
<VirtualHost 64.65.66.67>
   ServerAdmin [e-mail]
   ServerName www.example.com
   DocumentRoot /var/www/example
   .
   .
   . etc

So, the separate VirtualHost for "example.com" captures those requests and then permanently redirects them to your main VirtualHost. So there's no REGEX parsing with every request, and your client browsers will cache the redirect so they'll never (or rarely) request the "wrong" url again, saving you on server load.

Note, the trailing slash in Redirect permanent / http://www.example.com/. Without it, a redirect from example.com/asdf would redirect to http://www.example.comasdf instead of http://www.example.com/asdf.

Answer 4

I believe the top answer successfully redirects non-www to www (ex: mysite.com -> www.mysite.com), but doesn't take into account wildcard subdomains, which results in:

random.mysite.com -> www.random.mysite.com

Here's a solution with/without HTTPS

HTTP

RewriteEngine On

RewriteCond %{HTTP_HOST} !www.mysite.com$ [NC]
RewriteRule ^(.*)$ http%{ENV:protossl}://www.mysite.com/$1 [L,R=301] 

HTTP/HTTPS

RewriteEngine On

RewriteCond %{HTTPS} =on
RewriteRule ^(.*)$ - [env=protocol:https]

RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ - [env=protocol:http]

RewriteCond %{HTTP_HOST} !www.mysite.com$ [NC]
RewriteRule ^(.*)$ %{ENV:protocol}://www.mysite.com/$1 [L,R=301]

*note: I haven't tested https because I don't currently have a cert to test, but if someone can verify or optimize what I have that would be awesome.

Answer 5

RewriteEngine On

RewriteCond %{HTTP_HOST} !^www\.

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

For Https

RewriteCond %{HTTPS}s ^on(s)|

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

Answer 6

Write in .htaccess :)

## Redirect from non-www to www (remove the two lines below to enable)
    RewriteCond %{HTTP_HOST} !^www\. [NC]
    RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]