httpRequest POST file Upload multipart 1. is there a code example step-by-step, how to build each part  ? I tried the demo from intersystems doc's, I checked it in .Net response, that didnot recognize the File-data part 2. I noticed, there is : SET BinaryMIMEPart.ContentType="application/octet-stream" but missing :  SET BinaryMIMEPart.ContentDisposition (as analogue, let say for VBA EXCEL ) or I do it via the: Do BinaryMIMEPart.SetHeader("Content-Disposition",...) ? that is not analouge for VBA need any code example link, to execute correctly all the multipart (cache call it MIMEtype) settings