[racket] Web server and file upload/download examples

Hi,

I'm not very experienced with using the web server yet and am looking
for advice and examples of how to download and upload files. I'm
particularly interested in any example of uploading a file using a
racket client (not a browser) to the web server, because it seems hard
to understand this from just the docs alone. 

The background is that I'd like to use https for NAT traversal and my
application also involves the occasional file transfer. I'm aware it's
horribly slow and inefficient, but implementing reliable UDP-based
tunneling or even direct TCP NAT traversal in Racket would simply be
too much work for me at this time.


Best,

Erich