CORS无法正常工作的PHP

Question

我正在尝试通过CORS将表单数据从www.siteone.com发布到www.sitetwo.com。我的ajax代码是这样的：

<script>
$(document).ready(function(){
        $("#submit").live('click',function() {
            var url = "http://www.sitetwo.com/cors.php";
            var data = $('#form').serialize();
            jQuery.ajax({
                url : url,
                type: "POST",
                data : $('#form').serialize(),
                }).done(function(response){
                    alert(response);
                    }).fail(function(error){
                    console.log(error.statusText);
                    });
                return false;


});
});
</script>

并且文件cors.php www.sitetwo.com如下：

<?php
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
 echo "hai";
?>

但是仍然会引发Access-control-Allow-Origin错误。引发的错误是这样的：

XMLHttpRequest cannot load http://www.sitetwo.com/cors.php. Origin http://www.siteone.com is not allowed by Access-Control-Allow-Origin.

我知道，通过仅通过标头允许远程网站来使用CORS，就可以使用跨域请求。但是当我这样尝试时，会引发错误。我在这里错过了什么吗？这是我的请求/响应头：

Response Headers
Connection  Keep-Alive
Content-Length  487
Content-Type    text/html; charset=iso-8859-1
Date    Fri, 23 Aug 2013 05:53:20 GMT
Keep-Alive  timeout=15, max=99
Server  Apache/2.2.15 (CentOS)
WWW-Authenticate    Basic realm="Site two Server - Restricted Area"
Request Headers
Accept  */*
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Content-Length  43
Content-Type    application/x-www-form-urlencoded; charset=UTF-8
Host    www.sitetwo.com
Origin  http://www.siteone.com
Referer http://www.siteone.com/index.html
User-Agent  Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:23.0) Gecko/20100101 Firefox/23.0

Answer 1

最后，我本人已经解决了问题中解释的问题。我为访问标头实现的代码不正确。

下面提到的两行代码在给出时不起作用：

<?php
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
?>

但是，正确处理CORS请求要花些时间。这是一个可以更充分响应的功能。更新的代码是这样的：

 <?php
    // Allow from any origin
    if (isset($_SERVER['HTTP_ORIGIN'])) {
        header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
        header('Access-Control-Allow-Credentials: true');
        header('Access-Control-Max-Age: 86400');    // cache for 1 day
    }

    // Access-Control headers are received during OPTIONS requests
    if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {

        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
            header("Access-Control-Allow-Methods: GET, POST, OPTIONS");

        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
            header("Access-Control-Allow-Headers:        {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

        exit(0);
    }

    echo "You have CORS!";
?>