How can I turn this into a node red flow using the http request node? The file can come from a file node.
Just putting the binary buffer in payload does not solve the issue and in the response message it says that field audio_file is missing.
So I guess I somehow have to tell the http request node that this binary buffer from the file node is "audio_file"
thank you, I found other topics but the solution didn't work (they were splitting the message in multipart headers manually). Your solution from the pdf file works.