We have a requirement to send 2 files with Content-Type as multipart/form-data with boundary value.Does anyone know how this can be done in Apigee ?

I am trying to send 2 files to the backend as multipart/form-data using POST.But I am getting below error from the backend :"Missing Parameter: Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadExc...