An 'Invalid' boundary 'for' Multipart /form-data 'request' error occurred regarding the use of 'multipart'

[Sparkel-wsl]

• I have looked for existing issues (including closed) about this

Bug Report

Version

cargo 1.64.0 (387270bc7 2022-09-16)

Platform

Windows 10 64-bit

Crates

axum = { version = "0.6.1",features=["multipart"]}

Description

Hello, I wrote the backend of 'ueditor' in 'rust', normal images can be uploaded normally, http headers are: Content-type:application/json, but when uploads the doodle file, we get an error 'multipart/form-data' request '. When I look at the http request headers, I see Content-Type: application/x-www-form-urlencoded, which is a base64 string in form-data. Looking at the axum documentation, I found that axum::Form accepts.

But uploading images and doodling must be the same request address. How can axum be compatible with both headers Content-type:application/json Content-Type: application/x-www-form-urlencoded request.

你好，我使用 rust 编写 ueditor 的后端，普通图片可以正常上传，http headers是：Content-type:application/json，但在上传涂鸦文件时，发生了这么一个错误multipart/form-data request`。我查看http request headers 发现 Content-Type : application/x-www-form-urlencoded，在 form-data 里面的值是 base64字符串。我查阅 axum的文档后发现，可以用axum::Form 接收。

但是上传图片和涂鸦必须是一个请求地址，axum 如何同时兼容headers Content-type:application/json Content-Type : application/x-www-form-urlencoded 的请求。

[davidpdrsn]

Have a look at this example https://github.com/tokio-rs/axum/blob/main/examples/parse-body-based-on-content-type/src/main.rs

[Sparkel-wsl]

Thank you very much

[iyra]

I ran into this today; the example suggested in the other comment may not be necessary.

To anyone else coming across this, ensure that your form element (or your Postman request) is formatted using "multipart/form-data" (i.e. <form action="..." method="post" enctype="multipart/form-data">.)

The default of x-www-urlencoded does not play nicely with Axum's multipart, nor with axum_typed_multipart.