我怎样才能获得通过跨域Ajax响应头？ [英] How can I get response header via cross-domain ajax?

问题描述

我想阅读的文档，我必须承认这不是一件容易的阅读。我有没有问题（添加访问控制 - 允许 - 产地标头后）读取的responseText，但未能得到响应头的任何地方，除了Firefox浏览器。

I'm trying to read documentation and I must confess it is not an easy reading. I have no problem (after adding Access-Control-Allow-Origin header) to read responseText, but fail to get response header anywhere except Firefox.

所以，我的问题是什么是正确的方式来获得响应头，使用跨域AJAX？

So, my question is what is the right way to get response header, using cross-domain ajax?

我试图用（<一href="https://developer.mozilla.org/en/http_access_control#Access-Control-Expose-Header">Access-Control-Expose-Headers),但同样，无法读取头。

I've tried to use (Access-Control-Expose-Headers), but, again, failed to read header.

推荐答案

所以它应该工作的方式是，你指定你希望客户端访问的标头中的访问控制，揭露-头头。例如，如果你的服务器设置一个Foo响应头，并且希望客户端能够阅读它，您的服务器也应该发送下面的标题：

So the way it should work is that you specify the headers you want the client to have access to in the Access-Control-Expose-Headers header. For example, if your server sets a Foo response header, and you want the client to be able to read it, your server should also send the following header:

Access-Control-Expose-Headers: Foo

在客户端，您可以通过调用xhr.getAllResponseHeaders读取所有的响应头（）。这将返回的响应头为一个字符串，然后您可以解析到一个对象使用下列code：的https： //gist.github.com/706839

On the client side, you can read all the response headers by calling xhr.getAllResponseHeaders(). This returns the response headers as a string, which you can then parse into an object using the following code: https://gist.github.com/706839

这就是事情的的应该的工作进行说明。但是，注意，是在旧的浏览器了一个错误的响应头不能被读取客户机上。在这里看到更多的细节：<一href="http://stackoverflow.com/questions/4561221/cors-xmlhtt$p$pquest-head-method/4863887#486388">CORS xmlhtt prequest HEAD方法

That is an explanation of how things should work. However, note that there is a bug in older browsers where the response headers can't be read on the client. See here for more details: CORS xmlhttprequest HEAD method

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