XMLHtt prequest setRequestHeader错误 [英] XMLHttpRequest setRequestHeader Error

问题描述

IE 9开发者工具说未指定的错误。在这条线的code：

IE 9 developer tools say "Unspecified error." at this line of code:

xmlhttp.setRequestHeader ("If-Modified-Since", "Sat 1 Jan 2005 00:00:00 GMT");

我试图禁用Ajax请求的高速缓存和我没有对服务器的控制，我不能附加一个唯一的ID为每个请求的结束，所以这看起来像我唯一的选择。任何想法，为什么JavaScript不喜欢呢？

I am trying to disable caching of Ajax requests and I don't have control over the server and I cannot append a unique ID to the end of each request, so this looks like my only option. Any ideas why Javascript doesn't like it?

推荐答案

我在调用此之前 xmlhttp.open（...）; 。那是错误的。修改标题打开请求后，但在此之前你送吧。

I was calling this before xmlhttp.open (...);. That was the mistake. Modify the header after you open the request, but before you send it.

xmlhttp.open (...);
xmlhttp.setRequestHeader ("...", "...");
xmlhttp.send ();

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