试试这个:

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

如果主机以www开头，我们将整个主机粘贴到URL的开头，然后去掉“www”。

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

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

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);
        }
    }
});

我让它起作用的唯一方法…

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

以下是将一个www URL重定向到no-www的规则:

#########################
# redirect www to no-www
#########################

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

以下是将一个no-www URL重定向到www的规则:

#########################
# redirect no-www to www
#########################

RewriteCond %{HTTP_HOST} ^(?!www\.)(.+) [NC]
RewriteRule ^(.*) http://www.%1/$1 [R=301,NE,L]

注意，我使用了NE标志来防止apache转义查询字符串。如果没有这个标志，apache将把请求的URL http://www.example.com/?foo%20bar更改为http://www.example.com/?foo%2250bar