#!/bin/sh
E=printf R=$($E \\r)
for U
do
X(){
$E %s\\r\\n "GET /${Q#/} HTTP/1.0" "Host: $D" ''
}
Y(){
while
IFS=$R read -r A B
[ "$A" ]
do
$E %s\\n "$A"
done>&2
echo>&2
cat
}
S="${U%%:*}" S="${S##*[!a-z0-9-]*}"
[ "$S" ]&&U="${U#$S://}"||U="${U#//}"
H="${U%%/*}" Q="${U#"$H"}" D="${H%:*}"
[ "$H" = "${D:?}" ]&&P="${PORT:-80}"||P="${H##*:}"
if
(: </dev/udp/localhost/0)2>&-
then
exec 3<>"/dev/tcp/$D/$P"&&X>&3&&Y<&3
exec 3>&-
else
X|/usr/bin/env nc -- "$D" "$P"|Y
fi
done