在特定页面中忽略FormData

Question

我尝试在IE10中使用XHR发送FormData时遇到了荒谬的问题。 我发现FormData在特定页面中被忽略，代码如下所示。

可以猜到什么是理由？ 页面具有相同的DOCTYPE。

var o = new FormData(); 
o.append("test", "1234"); 
var xhr = new XMLHttpRequest(); 
xhr.open("POST", "/files"); 
xhr.send(o);

通常情况下：

POST https://github.com/files HTTP/1.1
Accept: */*
Content-Type: multipart/form-data; boundary=---------------------------7de290c360a6e
Referer: (something)
Accept-Language: ko-KR,ja;q=0.5
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1;; APCPMS=^N20120502090046254556C65BBCE3E22DEE3F_477^; Trident/6.0; TCO_20140226091802)
Host: github.com
Content-Length: 143
DNT: 1
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: (deleted)

-----------------------------7de290c360a6e
Content-Disposition: form-data; name="test"

1234
-----------------------------7de290c360a6e--

异常情况：

POST http://foo.bar.com/files HTTP/1.1
Accept: */*
Content-Type: multipart/form-data; boundary=---------------------------7de1b67c0afe
Referer: http://foo.bar.com/page
Accept-Language: ko-KR,ja;q=0.5
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1;;     APCPMS=^N20120502090046254556C65BBCE3E22DEE3F_477^; Trident/6.0; TCO_20140226091802)
Connection: Keep-Alive
Content-Length: 0
DNT: 1
Host: dhive.nhnre.com:8888
Pragma: no-cache
Cookie: (deleted)