codeigniter base url not working correctly

I just launched a new site and I have the base url as:

$config['base_url'] = 'http://x.com/';

which works but when i go to www.x.com in my browser I get page not found error. When I set the base url to 'http://www.x.com/'. Now the site does not work anymore. Does anyo开发者_运维百科ne know how to fix this? I am lost on how to get this going.

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It sounds like you actually have an issue with your VirtualHosts. That would explain why you're getting 404's. Try adding this to your httpd.conf or equivalent and then restart Apache:

# Place this in the virtualhost listening to x.com.
ServerAlias www.x.com

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Try:

$config['base_url'] = 'http';
if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on"){
    $config['base_url'] .= "s";
}
$config['base_url'] .= "://";
if ($_SERVER["SERVER_PORT"]!= "80"){
    $config['base_url'] .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"];
}else{
    $config['base_url'] .= $_SERVER["SERVER_NAME"];
}

$config["base_url"]."/";