To handle multi-VALUE fields in a POST request

I have this request working on a Linux terminal:

`curl -X POST "https://my-api.plantnet.org/v2/identify/all?api-key=11111111111111111111" -H "accept: application/json" -F "organs=flower" -F "organs=leaf" -F "images=@images/image_1.jpeg" -F "images=@images/image_2.jpeg"
`

As you may have seen there are two **multi-value fields**, _organs_ and _images_, one is for _String_ objects and the another is for _File_ objects.

I'm trying to recreate this command by using **http** package with Dart. I've used **post** and **MultipartRequest** methods but these methods does apparently not support fields with multiple values like the request showed above. I've googled and posted questions in forums, NO ANSWERS. So I must suppose this feature is not implemented for this package, therefore I request you can implement it please.

PS: in other languages like Javascript is possible to send fields with multi-values.

The issue names the Dart http package's post and MultipartRequest APIs; start by inspecting how those APIs represent repeated organs and images fields, then reproduce the curl example. Done means a multipart POST can send repeated string and file values in the same request.

Written by the indexing model from the issue text.