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我遇到了 URLLoader/URLRequest 的一个非常奇怪的行为。看看下面的代码：

var loader:URLLoader   = new URLLoader();
loader.dataFormat = URLLoaderDataFormat.BINARY;

var request:URLRequest = new URLRequest(url);
request.method = URLRequestMethod.POST;

if (params.action is ByteArray) {
    params.action = Base64.encodeByteArray(params.action);
}

var vars:URLVariables = new URLVariables();
for (var paramName:String in params) {
    vars[paramName] = params[paramName];
} 
request.data = vars;

loader.load(request);

当我检查 HTTP 原始请求时，我看到：

POST /actions/send/3882-fba04fd1db5b0ac4f4107dd06632e851 HTTP/1.1
Host: domainname.com
Content-Length: 237
Origin: http://anotherdomain.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.168 Safari/535.19
Content-Type: application/x-www-form-urlencoded
Accept: */*
Referer: http://anotherdomain.com/page.html
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: foo=bar
Pragma: no-cache
Cache-Control: no-cache

Content-type: application/x-www-form-urlencoded
Content-length: 165

action=BASE64DATABASE64DATABASE64DATABASE64DATABASE64DATABASE64DATABASE64DATA

所以.. wtf？为什么 URLLoader在标头\r\n之后插入Cache-Control: no-cache？试图找到解决方案，但没有任何运气。

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