Jquery 如何使跨域资源共享 (CORS) 发布请求正常工作

我在本地局域网(machineA)上有一台机器，它有两台web服务器.第一个是XBMC内置的(在8080端口)并显示我们的库.第二台服务器是CherryPy python脚本(端口8081)，我正在使用它按需触发文件转换.文件转换由来自XBMC服务器提供的页面的AJAX POST请求触发.

• Goto http://machineA:8080显示图书馆
• 将显示库
• 用户点击"转换"链接，发出以下命令-

jQuery Ajax请求

$.post('http://machineA:8081', {file_url: 'asfd'}, function(d){console.log(d)})

• 浏览器发出带有以下标题的HTTP选项请求；

Request Header - OPTIONS个

Host: machineA:8081
User-Agent: ... Firefox/4.01
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Origin: http://machineA:8080
Access-Control-Request-Method: POST
Access-Control-Request-Headers: x-requested-with

• 服务器响应如下:；

Response Header - OPTIONS (STATUS = 200 OK)个

Content-Length: 0
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 1728000
Server: CherryPy/3.2.0
Date: Thu, 21 Apr 2011 22:40:29 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Content-Type: text/html;charset=ISO-8859-1

• 然后对话就停止了.理论上，当服务器用正确的(？)响应时，浏览器应该发出POST请求CORS标题(访问控制允许来源:)

为了排除故障，我还从http://jquery.com发出了相同的$.post命令.这就是我被难住的地方，来自jquery.com的POST请求起作用，OPTIONS请求紧跟在POST之后发送.此事务的标题如下；

Request Header - OPTIONS个

Host: machineA:8081
User-Agent: ... Firefox/4.01
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Origin: http://jquery.com
Access-Control-Request-Method: POST

Response Header - OPTIONS (STATUS = 200 OK)个

Content-Length: 0
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 1728000
Server: CherryPy/3.2.0
Date: Thu, 21 Apr 2011 22:37:59 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Content-Type: text/html;charset=ISO-8859-1

Request Header - POST个

Host: machineA:8081
User-Agent: ... Firefox/4.01
Accept: */*
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://jquery.com/
Content-Length: 12
Origin: http://jquery.com
Pragma: no-cache
Cache-Control: no-cache

Response Header - POST (STATUS = 200 OK)

Content-Length: 32
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 1728000
Server: CherryPy/3.2.0
Date: Thu, 21 Apr 2011 22:37:59 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Content-Type: application/json

我不明白为什么同一个请求在一个站点上有效，而在另一个站点上无效.我希望有人能指出我遗漏了什么.谢谢你的帮助！