Closes#1389.

I had to add araw param to put/post like we have for get, instead of usingfiles with the multipart encoder, to really ensure only the raw data ended up as the uploaded package 🤔

Maybe it's just howfiles are handled currently and can still be refactored to take out redundant stuff if we want a raw upload. In the meantime I also cleaned out some code fromhttp_request into a helper method and centralized the content_types there (http_request would be getting quite long and messy otherwise).