如何设置一个HTTP GET请求头，并触发文件下载？

问题描述

更新 20140702：

Update 20140702:

• 解决方案
• 详细答案，一篇博客文章

• The solution
• Detailed answer as a blog post

（但我打其他的答案之一。因为它让我半路上，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)

看来，设置一个HTTP请求头是不可能通过链接与＆LT; A HREF =...＆GT; ，并且只能使用做 XMLHtt prequest 。

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

不过，联系到URL是要下载（浏览器不应该导航到它的URL）的文件，我不知道这是可以使用AJAX来完成。

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.

此外，正在返回的文件是二进制文件，和AJAX不用于该

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

如何将一去触发文件下载使用具有添加到它的自定义标题中的HTTP请求？

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

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)
                }
            });
        });

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

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