Has anyone tried to attach a file calling an API created in grails.node.js from within webmethods

We have a need to post a file attachment to an API created in grails.

Overview:

  1. Webmethods will get the pdf file from our data share file system and making it a stream.
  2. Webmethods will then use the pub.client:http to try to POST the file out to the URL for the API

we are getting a 400 bad request. Has anyone done this within webmethods and how did they solve it?