XMLHttpRequest multipart / form-data：多部分中的边界无效 [英] XMLHttpRequest multipart/form-data: Invalid boundary in multipart

问题描述

我通过XMLHttpRequest发送帖子数据：

I am sending post data via XMLHttpRequest:

var xmlHttp=new XMLHttpRequest();
xmlHttp.open("POST", domain, true);
xmlHttp.setRequestHeader("Content-type","multipart/form-data");
var formData = new FormData();  
formData.append("data", data_json_string);
xmlHttp.send(formData);

在Python中，如果我尝试获取POST（或FILES或任何）数据，我会收到错误：

In Python, I get an error if I try to get the POST (or FILES or anything) data:

MultiPartParserError: Invalid boundary in multipart: None

这可不可行吗？我是否真的需要将表单主体创建为单个字符串，我在其中循环参数并在每个参数之前和之后放置一个边界字符串？如果是这样，那应该是什么样的？如何从我的POST中获取它？或者有一种更简单的方法。我正在环顾四周，并没有找到太多。

Can this never work?? Do I really need to create the form body as a single string where I loop through the parameters and place a boundary string before and after each one? And, if so, what should that look like? How do I get it from my POST in Python?? Or is there an easier way. I'm looking around and not finding much on this.

btw，我正在使用multipart / form-data，因为我的字符串数据非常长而且这是一个更快的发送方式。当我创建表单并发布它，将其定位到iframe时，它对我有用。但在这里我更喜欢xmlHttp。

btw, I am using "multipart/form-data" because my string data is really long and this is a faster way to send it. It has worked for me when I create a form and post it, targeting it to an iframe. But here I much prefer xmlHttp.

推荐答案

不要设置 Content-Type 自己头。它将在 .send（）数据时正确设置，包括手动生成的标头缺少的正确生成的边界。

Do not set the Content-Type header yourself. It will be properly set when .send()ing the data, including the proper generated boundary, which your manually generated header lacks.

规范明确指出 .send（FormData）将使用multipart / form-data编码。

The spec clearly states that .send(FormData) will use multipart/form-data encoding.

如果数据是FormData

If data is a FormData

让请求实体体是运行multipart / form-data编码算法的结果，数据作为表单数据集，并使用UTF-8作为显式字符编码。

Let the request entity body be the result of running the multipart/form-data encoding algorithm with data as form data set and with UTF-8 as the explicit character encoding.

让mime类型为multipart / form-data;，U + 0020 SPACE字符，boundary =和multipart / form-data的串联由multipart / form-data编码算法生成的边界字符串。

Let mime type be the concatenation of "multipart/form-data;", a U+0020 SPACE character, "boundary=", and the multipart/form-data boundary string generated by the multipart/form-data encoding algorithm.

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