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  • $\begingroup$ I already have working code. The HTML snippet is what I am trying to mimic in URLExecute. $\endgroup$ Commented Oct 18, 2015 at 21:34
  • $\begingroup$ It should send a jpeg file via a POST to a REST service. I posted further code where sending a text file works. I've also tried sending a Import["test.jpg","JPEG"] but I get errors. $\endgroup$ Commented Oct 21, 2015 at 5:39
  • $\begingroup$ The mime type of JPEG files is image/jpeg, not file. Try changing that. $\endgroup$ Commented Oct 22, 2015 at 3:01
  • $\begingroup$ You end up with: The value {{jpgFile,image/jpeg}->Image[RawArray[Byte,<56,75,3>],Byte,<<1>>,<<12>>->True,MetaInformation->{Exif->{ImageWidth->4288,ImageLength->2848,BitsPerSample->{<<3>>},Make->NIKON CORPORATION,<<43>>,FocalLengthIn35mmFilm->34,SceneCaptureType->0,GainControl->1,<<5>>}}]} specified for the option MultipartElements is invalid. $\endgroup$ Commented Oct 22, 2015 at 5:54
  • $\begingroup$ Specifying text I instead of Jpeg image data does nothing either. $\endgroup$ Commented Oct 22, 2015 at 5:56