Khalil Shreateh specializes in cybersecurity, particularly as a "white hat" hacker. He focuses on identifying and reporting security vulnerabilities in software and online platforms, with notable expertise in web application security. His most prominent work includes discovering a critical flaw in Facebook's system in 2013. Additionally, he develops free social media tools and browser extensions, contributing to digital security and user accessibility.

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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;
}
 
In this case, your primary server block should not contain your naked domain.
 
 
Article at :yes-www.org