Static HTTP server written in bash(-ish)

server.sh

LOCATION="$1"
RES=/tmp/webreq
[ ! -p $RES ] && mkfifo $RES

function get_docment {
  LOCATION=$(realpath .$(realpath "/$1"))
  [ -d "$LOCATION" ] && echo "$LOCATION/index.html" || echo "$LOCATION"
}

function SEND {
    cat >$RES <<EOF
HTTP/1.0 200 OK
Cache-Control: private
Content-Type: $(file -b --mimetype "$1")
Server: bash-http-server
Connection: Close

$(cat $1)
EOF
}

function NOT_FOUND {
    cat >$RES <<EOF
HTTP/1.0 404 Not Found
Cache-Control: private
Server: bash-http-server
Connection: Close

Not found
EOF
}

while true; do
  cat $RES | ncat -l 4444 | (
    REQ=$(while read I && [ " " "<" "$I" ]; do echo "$I"; done)
    FILE=.$(echo $REQ | head -1 | cut -d " " -f 2)
    DOCUMENT=$(get_docment $FILE)
    echo "Requesting $DOCUMENT"
    [ -f "$DOCUMENT" ] && SEND "$DOCUMENT" || NOT_FOUND
  )
done