http server with gzip compression in shell script.

httpserv.sh

#!/bin/bash

######################
# AUTHOR: Inndy      #
# DATE:   2014/04/11 #
######################

MIME_DEFAULT="text/html"

if [ -z $1 ] || [ -z $2 ]; then
    echo "Usage: $0 <file> <port> [mime]"
    echo "  Default mime-type is '$MIME_DEFAULT'"
    exit 1
fi

file=$1
port=$2
mime=$3

if [ ! -e $file ]; then
    echo "File not exists (\"$file\")"
    exit 2
fi

if [ ! -z $(echo $port | sed -e 's/[0-9]//g') ]; then
    echo "Port must be number"
    exit 3
fi

if [ $port -le 0 ] || [ $port -ge 65536 ]; then
    echo "Port is not correct"
    exit 4
fi

if [ -z $mime ]; then
    mime=$MIME_DEFAULT
fi

size=$(gzip -c $file | wc --bytes | tr -d '\n')

echo "Ctrl-C to stop server..."
until [ $? -eq 130 ]; do
    (\
        echo -ne "HTTP/1.1 200 OK\r\n";\
        echo -ne "Connection: Close\r\n";\
        echo -ne "Content-Encoding: gzip\r\n";\
        echo -ne "Content-Type: $mime\r\n";\
        echo -ne "Content-Size: $size\r\n";\
        echo -ne "\r\n";\
        gzip -c $file;\
        echo -ne "\r\n0\r\n"\
    ) | nc -lp $port | head -n 1
done