bad shell proxy

#!/bin/sh

proxyhost=localhost

read method file http

if [ "$method" != "GET" ]; then
    printf "HTTP/1.0 405 Method Not Allowed\r\n"
    printf "Content-type: text/plain\r\n"
    printf "Connection: close\r\n\r\nMethod Not Allowed\r\n"
    exit 111
fi

if [ -d "$file" ]; then
    printf "HTTP/1.0 403 Forbidden\r\n"
    printf "Content-type: text/plain\r\n"
    printf "Connection: close\r\n\r\nForbidden\r\n"
    exit 111
fi

if [ -r "$file" ]; then
    printf "HTTP/1.0 200 OK\r\n"
    printf "Content-type: text/plain\r\n\r\n"
    cat $file
else
    printf "$method $file HTTP/1.0\r\nHost: $proxyhost\r\n\r\n" |
        nc $proxyhost 80
fi