[racket] "upload file" button in a Racket web server

From: Mitchell Wand (wand at ccs.neu.edu)
Date: Thu Jul 31 22:21:15 EDT 2014

Many web pages have an "upload file" button that allows the user to
drag&drop a file onto the button, and then hitting the button sends the
file to the server.

Is there any way of doing this in a Racket web server?  If not, how close
can we come?

--Mitch
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