使用apache重定向规则是这样写的，把它翻译成nginx

RewriteCond  %{HTTP_HOST}  example.org
RewriteRule  (.*)          http://www.example.org$1

server {
    listen       80;
    server_name  www.example.org  example.org;
    if ($http_host = example.org) {
        rewrite  (.*)  http://www.example.org$1;
    }
    ...
}

上面的方式是错误的，应该是下面的这种方式:

server {
    listen       80;
    server_name  example.org;
    return       301 http://www.example.org$request_uri;
}

server {
    listen       80;
    server_name  www.example.org;
    ...
}

On versions prior to 0.9.1, redirects can be made with:

    rewrite      ^ http://www.example.org$request_uri?;