Encoding multipart/form-data HTTP body

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Hi, I am little confused about the PR you pointed me out, on Finch.

my use case is, I am trying to send a multipart request using Finch.

in past with HTTPoison. it was like this

HTTPoison.post(
  url,
  {:multipart, [{file_path, image, []}]},
  [],
  hackney: [pool: :seaweedfs_upload_pool, recv_timeout: 15_000]
)

URL = http://localhost:8888/everc-dupzo/snapshots/oldest-1572566369.jpg
file_path = /snapshots/oldest-1572566369.jpg
and the image is a binary data, which you can get while doing File.read!.

I have done every other replacement of HTTPoison but this has become a road blocker for me.

I have also tried to do simple post request using the data but it’s not working either.

Can you guide me how I Can send an Image binary data as a multipart request?

NOTE: in above HTTPoison request, the image is not saved on disk at all.