httpcat.sh

 #!/bin/sh

PORT="$1"
FILE="$2"
SIZE=`/usr/bin/wc -c "$FILE" | /usr/bin/awk '{print$1}'`

(
/bin/cat <<EoF
HTTP/1.1 200 OK
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="$FILE"
Content-Length: $SIZE
Connection: close
EoF
/bin/cat "$FILE"
) | /bin/nc -lp $PORT