KSH Web Server

This is a barely functioning webserver I wrote for fun while staying in a cabin in the woods.

#!/bin/ksh

# Settings
app_name="Shell Webserver"
version="0.2"
port="8080"
fifo="/home/cosmic/http"

# Trap
trap 'clean_exit' INT TERM HUP KILL

# Functions
clean_exit() {
    echo
    rm "$fifo" && log "FIFO destroyed"
    pkill nc && log "nc killed" || log "nc not running"
    log "Bye! :)"
    exit 0
}

log() {
    date_string="$(date +"%Y-%m-%d %H:%M:%S")"
    printf "%s: %s\n" "$date_string"  "$1"
}

# Init
log "${app_name} v${version} - Starting up"

# Create pipe
test -p "$fifo" || (mkfifo "$fifo"; log "FIFO created")

# Main loop
counter=0
while true
do
    log "Inc counter"
    counter=$(( $counter + 1 ))

    log "Configuring response"
    http_status="200 OK"
    content_type="text/plain"
    response_text="Hello, world! Visitor number: ${counter}"

    log "Creating response"
    response=$(
cat <<EOF
HTTP/${http_status}
Host: $(hostname)
Content-Type: ${content_type}
Content-Length: ${#response_text}

${response_text}
EOF
)

    # Server
    log "Start server..."

    HTTP_RESPONSE="$(

        # Start listener
        nc -l "$port" < $fifo &
        log "Now listening on port ${port}"

        log "Incoming request: ${counter}"

        # Send response
        printf "%s" "$response" > $fifo &
    )"

printf "%s" "$response" > $fifo &

    # Print request
    log "Request data:"
    echo "${HTTP_RESPONSE}"
    log "Request EOF"

done