ExtJS 4.2.1:无法在 Ext.ajax.request 回调时检索 HTTP 响应标头 [英] ExtJS 4.2.1: Cannot retrieve HTTP Response headers upon Ext.ajax.request callback

问题描述

我正在尝试读取 Ext.ajax.request 上即将到来的响应的标头.

I'm trying to read the headers of the coming response upon Ext.ajax.request.

代码如下:

Ext.Ajax.request({ url: 'http://localhost:3000/v0.1/login' ,
    method: 'POST',
    scope:this,
    jsonData: {"_username":username,"_userpwd":password},
    success: function(responseObject){
        var headers = responseObject.getAllResponseHeaders();
        console.info(headers );
        Ext.destroy(Ext.ComponentQuery.query('#loginWindow'));
        this.application.getController('SiteViewController').showView();
    },
    failure: function(responseObject){
        alert(responseObject.status);
    }
    });

但它在控制台中打印出来的唯一标题是:

But the only header that it is printed out in console is:

Object {content-type: "application/json; charset=utf-8"} 

所有其他标题都丢失了，但它们存在于 chrome 检查器中！！！

All the other headers are missing, but they are present in the chrome inspector!!!

我错过了什么?谢谢

推荐答案

因为您可能正在执行跨域请求，所以您只会有服务器显式公开的标头.相同的域请求会公开所有标头.

Because you're probably doing a cross-domain request, you will only have headers explicitly exposed by the server. Same domain requests expose all the headers.

在服务器端，您必须添加标题Access-Control-Expose-Headers"，其中包含要公开的标题的详尽列表，以逗号分隔.在 php 中，它看起来像这样:

On the server side you have to add the header "Access-Control-Expose-Headers" with the exhaustive list of headers you want to expose, separated by a coma. In php it would look like this:

header("Access-Control-Expose-Headers: Content-length, X-My-Own-Header");

标题确实可以通过 responseObject.getAllResponseHeaders() 或类似 responseObject.getResponseHeader('content-type') 的东西获得.

The headers will indeed be available through responseObject.getAllResponseHeaders() or something like responseObject.getResponseHeader('content-type').

有关跨域请求和标头的更多信息:http://www.html5rocks.com/en/tutorials/cors/

More information about cross-domain requests and headers: http://www.html5rocks.com/en/tutorials/cors/

PS:Ace.Yin 的答案是正确的，但我没有足够的声誉来简单地评论.

PS: Ace.Yin had the right answer, but I don't have enough reputation to simply comment.

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