Transfer Type
The vWorkApp API can only accept HTTP POSTs with Content-Length specified; chunked transfer is not supported.
Request Headers
You should specify your request content in the request headers as follows:
Content-Type
application/xml; charset=utf-8
If this is not set, then V4 of the API will return a 422 message, with the error "Job Document is Empty", V2 of the API will return a 400 error.