Thanks for the response @al2o3cr
I believe you may be right about the content-length. I setup a local server to capture raw post dumps and could not really see why the httpoison request would fail while the insomnia request works fine as both requests looked correct. Testing it with pipedream showed no errors and I was able to download the attached file.
If some servers don’t like content length on the fields, that would explain why I get a request 400 from this vendor. I reached out to them asking about it.
