ajax响应:无法读取响应中的所有标头 [英] ajax response: cannot read all the headers from the response

问题描述

我正在使用ajax( CORS )发出发布请求，并设置了标头( Content-Type:application/x-www-form-urlencoded )并且我正在尝试读取响应的标题.这是我所做的:

I'm making a post request with ajax (CORS) and I am setting a header (Content-Type:application/x-www-form-urlencoded) and I'm trying to read the response's headers. Here is what I've done:

function makePostRequest(url, data, headers, httpVerb, dataType, elementId) {
    $.ajax({
        url: url,
        type: httpVerb,
        data: data,
        headers: headers,
        dataType: dataType,
        success: function(data, textStatus, jqXHR) {
            $("#" + elementId).val(jqXHR.responseText);
            alert(JSON.stringify(jqXHR));
        },
        error: function(jqXHR, textStatus, errorThrown) {
            $("#" + elementId).val(jqXHR.responseText);
        }
    }).then(function(data, status, xhr) {
        console.log(xhr.getAllResponseHeaders());
    });
}

但是在控制台中仅打印

Content-Type: application/x-www-form-urlencoded; charset=utf-8

在chrome开发人员工具中，我看到了:

And in chrome developer tools I'm seeing:

如何获取所有这些标头?

How to get all these headers?

PS:我使用的是Chrome，而不是Firefox()

PS: I am using Chrome, not Firefox ()

我问如何获取所有标头，而不是为什么我只得到一个标头(如果不可能的话，我会接受这个答案).

I asked how to get all headers, not why I'm getting only one header(if it's not possible, I will accept this answer).

推荐答案

因此，我正在发出 CORS 请求，在这种情况下，出于安全原因将标头过滤掉了.

So, I was making a CORS request and in this case the headers are filtered out for security reasons.

访问这些标头的唯一方法是在响应中包含标头 Access-Control-Expose-Headers ，该标头包含可以从javascript中读取的标头列表，您可以在此处阅读:

The only way to acces those headers is to include in the response a header Access-Control-Expose-Headers that will contain a list of headers that can be read from the javascript, as you can read here:

7.1.1处理对跨域请求的响应

7.1.1 Handling a Response to a Cross-Origin Request

用户代理必须过滤掉除响应头以外的所有响应头是简单的响应标头，或者其字段名是ASCII大小写不敏感的匹配值之一 Access-Control-Expose-Headers 标头(如果有的话)，在曝光之前对CORS API规范中定义的API的响应标头.

User agents must filter out all response headers other than those that are a simple response header or of which the field name is an ASCII case-insensitive match for one of the values of the Access-Control-Expose-Headers headers (if any), before exposing response headers to APIs defined in CORS API specifications.

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