A multipart request does not work when it contains application/json parts.

[jongidal]

My backend is Spring Boot.
An API accepts a multipart request containing JSON parts.

I set a request in Kreya like this:

But the backend throws an exception:
org.springframework.util.InvalidMimeTypeException: Invalid mime type "text/plain; charset=utf-8, application/json": utf-8, application/json

I tested the same API with Insomnia, and there was no problem.

The key differences between Kreya and Insomnia are these:

1. The mineType of a JSON part in a multipart request
   Insomnia: application/json
   Kreya: text/plain; charset=utf-8, application/json
2. The boundary text of Kreya contains quotation marks like this:
   

{
"kreyaVersion": "1.16.0",
"releaseChannel": "stable",
"osDescription": "Ubuntu Core 22",
"osVersion": "Unix 6.11.0.9",
"osArch": "X64",
"processArch": "X64",
"runtimeIdentifier": "linux-x64",
"userAgent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15"
}

[CommonGuy]

Thank you for reporting this. It seems like you discovered a long-standing bug in Kreya regarding multipart requests. We are working on a fix

[jongidal]

Thank you. I want to use Kreya with my team. Everything is great except this bug.

[CommonGuy]

We released a fix for this on our beta channel. See here on how to switch to the beta version: https://kreya.app/docs/faq/#how-can-i-use-kreya-beta-versions