To demonstrate how to hit this in a real use case, run the attached script which implements a simple http server that saves POSTed files to a local file "got_data". It returns the sha1sum of the POSTed file as the http response.

Then, create a test file consisting of 65,535 null bytes, and submit with curl.

-> % dd if=/dev/zero of=data bs=1 count=65535                                                                                           
65535+0 records in
65535+0 records out
65535 bytes (66 kB) copied, 0.0890487 s, 736 kB/s

-> % sha1sum data
391edab7225a1de662ebc3a1a670a20d8e6a226b  data

-> % curl -Fdata=@data http://localhost:8080/
8dd623ef130a8cd3e97086101a6e1255a91fb916%