如何设置HTTP GET请求的头文件，并触发文件下载？

问题描述

更新 20140702：

Update 20140702:

• The solution
• Detailed answer as a blog post

（但我' m标记其他答案之一被接受而不是我自己的
，因为它让我在中途，并奖励努力）

(but I'm marking one of the other answers as accepted instead of my own,as it got me halfway there, and to reward the effort)

似乎通过< a href =...> 的链接设置HTTP请求标头是不可能的，只能使用 XMLHttpRequest 。

It appears that setting a HTTP request header is not possible through links with <a href="...">, and can only be done using XMLHttpRequest.

但是，链接到的URL是一个应该被下载的文件（浏览器不应该导航到它的URL），我不知道这是可以使用AJAX。

However, the URL linked to is a file that should be downloaded (browser should not navigate to its URL), and I am not sure is this can be done using AJAX.

另外，返回的文件是一个二进制文件，而AJAX不是为此。

Additionally, the file being returned is a binary file, and AJAX is not intended for that.

如何触发一个带有自定义标头的HTTP请求的文件下载？

How would one go about triggering a file download with a HTTP request that has a custom header added to it?

编辑：修复断开的链接

推荐答案

尝试

html

<!-- placeholder ,
    `click` download , `.remove()` options ,
     at js callback , following js
-->
<a>download</a>

js

        $(document).ready(function () {
            $.ajax({
                // `url`
                url: '/echo/json/',
                type: "POST",
                dataType: 'json',
                // `file`, data-uri, base64
                data: {
                    json: JSON.stringify({
                        "file": "data:text/plain;base64,YWJj"
                    })
                },
                // `custom header`
                headers: {
                    "x-custom-header": 123
                },
                beforeSend: function (jqxhr) {
                    console.log(this.headers);
                    alert("custom headers" + JSON.stringify(this.headers));
                },
                success: function (data) {
                    // `file download`
                    $("a")
                        .attr({
                        "href": data.file,
                            "download": "file.txt"
                    })
                        .html($("a").attr("download"))
                        .get(0).click();
                    console.log(JSON.parse(JSON.stringify(data)));
                },
                error: function (jqxhr, textStatus, errorThrown) {
                  console.log(textStatus, errorThrown)
                }
            });
        });

jsfiddle

jsfiddle http://jsfiddle.net/guest271314/SJYy3/

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