Upload document through the REST API - multipart/mixed

Hi all,

We are trying to send a document to an external System (Tableau) by using the Tableau REST API. With other operations we have no Problems but this specific Operation requires the Content type to be "multipart/mixed" and appian only offers "multipart/form", which Returns a 500 error:

Does anybody know how to send a "multipart/mixed" request? I guess I Need to use "custom" Content Type but I have Syntax Errors everywhere when I try it. Is there an example anywhere? I cant find any in the appian documentation.

This is an example of what Tableau expects:

Thanks a lot!

  Discussion posts and replies are publicly visible