嗨，你可以在你的htaccess文件上使用以下规则:

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

使用:Javascript / jQuery

// similar behavior as an HTTP redirect
window.location.replace("http://www.stackoverflow.com");
// similar behavior as clicking on a link
window.location.href = "http://stackoverflow.com";

或. htaccess:

RewriteEngine On
RewriteBase /
Rewritecond %{HTTP_HOST} ^www\.yoursite\.com$ [NC]
RewriteRule ^(.*)$ https://yoursite.com/$1 [R=301,L]

PHP方法:

$protocol = (@$_SERVER["HTTPS"]    == "on") ? "https://" : "http://";

if (substr($_SERVER['HTTP_HOST'], 0, 4) !== 'www.') {
    header('Location: '.$protocol.'www.'.$_SERVER    ['HTTP_HOST'].'/'.$_SERVER['REQUEST_URI']);
    exit;
}

Ajax

$.ajax({
    type: "POST",
    url: reqUrl,
    data: reqBody,
    dataType: "json",
    success: function(data, textStatus) {
        if (data.redirect) {
            // data.redirect contains the string URL to redirect to
            window.location.href = data.redirect;
        }
        else {
            // data.form contains the HTML for the replacement form
            $("#myform").replaceWith(data.form);
        }
    }
});

我不知道你为什么要删除www。 但相反的版本是:

# non-www.* -> www.*, if subdomain exist, wont work
RewriteCond %{HTTP_HOST} ^whattimein\.com
RewriteRule ^(.*)$ http://www.whattimein.com/$1 [R=permanent,L]

这个脚本的优点是: 如果你有test.whattimein.com之类的(开发/测试环境) 它不会将U重定向到原始环境。

如果你强迫www。在url或强制SSL协议中，然后尝试在htaccess文件中使用可能的变体，例如:

RewriteEngine On
RewriteBase /

### Force WWW ###

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

## Force SSL ###

RewriteCond %{SERVER_PORT} 80 
RewriteRule ^(.*)$ https://example.com/$1 [R,L]

## Block  IP's ###
Order Deny,Allow
Deny from 256.251.0.139
Deny from 199.127.0.259

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

和迈克尔的一样，除了这个有用:P

添加如果localhost，忽略重定向(用于本地环境中的开发目的)。如果不是localhost AND(不是https或它是www)，重定向到https和非www。

RewriteEngine On

RewriteBase /
RewriteCond %{HTTP_HOST} !localhost [NC]
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]