Redirect to www

If you have any idea how to do this for any other web server not listed here, let me know and I will place the information here.

Apache

These directions are for Apache and require that mod_rewrite be enabled.

To make all the traffic for http://example.com/ politely and silently redirect to http://www.example.com/ simply create a file called .htaccess (if it doesn’t already exist) and add the following to it, changing the red text to match your domain:

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

For Apache, the line beginning with RewriteCond requires a backslash in front of each period in the domain name, but backslashes should not be used in the second line that begins with RewriteRule.

IIS 7+

To make all the traffic for http://example.com/ politely and silently redirect to http://www.example.com/ follow these steps:

First, install the URL Rewrite module.

Now add the following code to the <system.webServer> section of your web.config or applicationHost.config:

<rewrite>
   <rules>
      <rule name="Redirect example.com to www" patternSyntax="ECMAScript" stopProcessing="true">
         <match url=".*" />
         <conditions>
            <add input="{HTTP_HOST}" pattern="^example.com$" />
         </conditions>
         <action type="Redirect" url="http://www.example.com/{R:0}" />
      </rule>
   </rules>
</rewrite>

(Thanks to Scott Forsyth’s Blog; visit him if you want a point-and-click GUI method of setting up your redirect.)

nginx

To make all the traffic for http://example.com/ politely and silently redirect to http://www.example.com/ simply add a new server entry to your nginx.conf file (or conf directory such as sites-available/sites-enabled on Debian systems) and add the following to it, changing the red text to match your domain:

server {
   listen [::]:80;
   server_name example.com;
   return 301 $scheme://www.example.com$request_uri;
}

server {
   listen [::]:443;
   server_name example.com;
   ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
   ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
   return 301 $scheme://www.example.com$request_uri;
}

In this case, your primary server block should not contain your naked domain.