How do I redirect a URL to another URL in the hosts file, rather than redirecting an IP to a URL?

How do I redirect a URL to another UR开发者_如何学GoL in the hosts file, rather than redirecting an IP to a URL?

You can't. DNS (or the host files) lets you look up IP addresses for a given host name. There is no concept of remapping URLs at this level of networking. This needs to be done in your web server configuration.

you can install localhost (MAMP ,LAMP ..etc) , and redirect all links to 127.0.0.1 , then create script to redirect to any website .

here's PHP example

<?php
function curPageURL() {
    $pageURL = "http://";
    if ($_SERVER["SERVER_PORT"] != "80") {
        $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
    } else {
        $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
    }
    return $pageURL;
}
// if pageURL is facebook , redirect to medium.com
if(curPageURL() == "http://www.facebook.com/")
    header('Location: http://www.medium.com');
?>