我在本地局域网（machineA）上有一台具有两个Web服务器的计算机。第一个是XBMC中的内置端口（在端口8080上），并显示我们的库。第二台服务器是我用来根据需要触发文件转换的CherryPy
python脚本（端口8081）。由XBMC服务器提供的页面上的AJAX POST请求触发文件转换。

• 转到显示库的http：// machineA：8080
• 显示图书馆
• 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头的HTTP OPTIONS请求；

请求标头-选项

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

• 服务器响应以下内容；

响应标题-选项（状态= 200 OK）

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

• 然后对话停止。理论上，浏览器应该在服务器以正确的（？）CORS标头响应时发出POST请求（Access-Control-Allow-Origin：*）

为了进行故障排除，我还从http://jquery.com发出了相同的$
.post命令。这是我在jquery.com遇到麻烦的地方，发布请求有效，OPTIONS请求由POST发送。该事务的标题在下面；

请求标头-选项

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

响应标题-选项（状态= 200 OK）

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

请求标头-POST

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

响应标头-POST（状态= 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

我无法弄清楚为什么相同的请求会在一个站点上起作用，而在另一个站点上却不起作用。我希望有人能够指出我所缺少的。谢谢你的帮助！