jquery getResponseHeader 总是返回“未定义"?
我有一个通过 ajax 提交的表单.我正在使用 jquery 表单插件.我想要做的是获取从我的服务器返回的位置"标头.我可以在萤火虫中看到它.但是每当我在成功回调中调用 getResponseHeader() 函数时，它总是返回未定义"..
I have a a form that I am submitting via ajax. I am using the jquery form plugin. What I am trying to do is get the 'Location' header which is returned from my server. I can see it in firebug. But whenever I call the getResponseHeader() function in my success callback, it always returns 'undefined'..
代码:
form.ajaxForm({
dataType: 'xml',
data: {format: 'xml'},
resetForm: true,
success: function(xml,status,xhr){
var location = xhr.getResponseHeader('Location');
alert(location);
});
位置未定义.但我可以在萤火虫中看到位置"标题.我错过了什么?即使我从 xhr 对象调用 getAllResponseHeaders()，它也会返回 'undefined'
location is undefined. But I can see the 'Location' header in firebug. What am I missing? Even if I call getAllResponseHeaders() from the xhr object, it returns 'undefined'
推荐答案
如果这是 CORS 请求，你可能会在调试工具(例如 Chrome->Inspect Element->Network)中看到所有标头，但 xHR 对象只会检索标头(通过 xhr.getResponseHeader('Header')) 如果这样的标头是简单响应标头:
If this is a CORS request, you may see all headers in debug tools (such as Chrome->Inspect Element->Network), but the xHR object will only retrieve the header (via xhr.getResponseHeader('Header')) if such a header is a simple response header:
内容类型最后修改内容语言缓存控制过期语用
如果不在此集合中，则它必须存在于 Access-Control-Expose-Headers 服务器返回的标头.
If it is not in this set, it must be present in the Access-Control-Expose-Headers header returned by the server.
关于所讨论的情况，如果它是一个 CORS 请求，则只有当且仅当，才能通过 XMLHttpRequest 对象检索 Location 标头下面的标题也存在:
About the case in question, if it is a CORS request, one will only be able to retrieve the Location header throgh the XMLHttpRequest object if, and only if, the header below is also present:
Access-Control-Expose-Headers: Location
如果它不是 CORS 请求，XMLHttpRequest 将没有问题检索它.
If its not a CORS request, XMLHttpRequest will have no problem retrieving it.
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