Is your feature request related to a problem? Please describe.

Currently multipart integration uses request.formData() to parse the request body, but the implementation does not allow to consume file uploads as streams

Describe the solution you'd like

It should be possible to consume files as streams and pipe them directly for processing, so files are not loaded fully into memory. Especially for big files, this is a problem.

It could be a config option to not alter current behaviour.

Describe alternatives you've considered

Trying to create my own content parser, which is not easy.