使用。htaccess重定向到www或非www:

只需将以下代码行放入您的主根.htaccess文件中。 在这两种情况下，只需将domain.com更改为您自己的主机名。

重定向到www

<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{HTTP_HOST} ^domain\.tld [NC]
  RewriteRule ^(.*)$ http://www.domain.tld/$1 [L,R=301]
</IfModule>

重定向到非www

<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{HTTP_HOST} ^www\.domain\.tld [NC]
  RewriteRule ^(.*)$ http://domain.tld/$1 [L,R=301]
</IfModule>

如果.htaccess定制不是理想的选择:

我创建了简单的重定向服务器供公众使用。只需添加A或CNAME记录:

CNAME   r.simpleredirect.net
A       89.221.218.22

更多信息:https://simpleredirect.net

但是如果我们需要为单独的http和https这样做:

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

RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$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);
        }
    }
});

重定向非www到www(均:http + https)

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

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

如果你想在httpd.conf文件中这样做，你可以在没有mod_rewrite的情况下这样做(显然这样对性能更好)。

<VirtualHost *>
  ServerName www.example.com
  Redirect 301 / http://example.com/
</VirtualHost>

我在这里得到了答案:https://serverfault.com/questions/120488/redirect-url-within-apache-virtualhost/120507#120507