How to POST a multipart/form-data using Power Query's Web.Contents

Question

In Power Query, I can download data from Web using the Web.Contents function, but there\'s an api that required the request to contains multipart/form data in the following

Answer 1

multipart/form-data is a fairly complicated encoding, requiring a bunch of MIME-specific headers. I would first try to see if you can use application/x-www-form-urlencoded instead:

let
    actualUrl = "http://some.url",
    record = [__rdxml="some data"],
    body = Text.ToBinary(Uri.BuildQueryString(record)),
    options = [Headers =[#"Content-type"="application/x-www-form-urlencoded"], Content=body],
    result = Web.Contents(actualUrl, options)
in
    result

EDIT: I've come up with an example of using multipart/form-data with Power Query. It's at https://gist.github.com/CurtHagenlocher/b21ce9cddf54e3807317