* Switch from JSON to multipart file encoding for file upload
File upload is detected when body data contains a value of class FileUpload
Remaining JSON is converted to FormData
Enitre message is sent as multipart
* Switch from JSON to multipart file encoding for file upload (#6)
File upload is detected when body data contains a value of class FileUpload
Remaining JSON is converted to FormData
Enitre message is sent as multipart