appendFile
fun FormBuilder.appendFile(partName: String, file: File, contentType: String = "application/octet-stream", fileName: String = file.name)(source)
Appends a File to the multipart form with the given partName and contentType.
Parameters
partName
Form field name.
file
File to upload.
contentType
MIME type (e.g. "image/jpeg", "application/pdf").
fileName
File name sent in the Content-Disposition header. Defaults to File.name.