这似乎不起作用:
$.ajax({
url: "http://localhost:3000/foo.json",
data: { foo: 'bar' },
headers: { 'HTTP_X_CUSTOMHEADER': 'foobar' },
xhrFields: { withCredentials: true }
});
当我在jsfiddle上运行它时,一个OPTIONS请求(根据Chrome调试工具)会触发,如下所示:
Access-Control-Request-Headers: Origin, HTTP_X_CUSTOMHEADER, Accept
Access-Control-Request-Method: GET
Origin: http://fiddle.jshell.net
然后(根据Chrome调试工具)我的本地服务器返回以下标头:
(手动重新格式化以便于阅读)
Access-Control-Allow-Credentials: true
Access-Control-Allow-Headers: HTTP_X_CUSTOMHEADER
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Origin: http://fiddle.jshell.net
Access-Control-Max-Age: 10
Cache-Control: no-cache
Connection: Keep-Alive
Content-Length: 1
Content-Type: text/html; charset=utf-8
Date: Wed, 14 Sep 2011 22:42:28 GMT
Server: WEBrick/1.3.1 (Ruby/1.8.7/2010-01-10)
X-Runtime: 2
然后在控制台中我收到如下错误消息:
XMLHttpRequest cannot load http://localhost:3000/foo.json?foo=bar.
Origin http://fiddle.jshell.net is not allowed by Access-Control-Allow-Origin.
但是Access-Control-Allow-Origin标题看起来与我的服务器响应预检请求时相同.那么我在这里想到的这个难题是什么？