Multipart/form-data proxy pass?

[eboats]

Hello, I'm using nginx as a proxy to a backend API that takes a POST payload
of a csv file ( content type = multipart/form-data ).  I can see the request
getting to the API but the file is not being passed by nginx.  

What nginx config params do I need for nginx to pass the multipart/form-data
to the backend API?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,293076,293076#msg-293076