#!/usr/bin/env bash
set -euo pipefail

port="${1:?port is required}"
path="${2:?path is required}"

if [[ ! "$port" =~ ^[0-9]{1,5}$ ]] || (( port < 1 || port > 65535 )); then
    exit 64
fi

if [[ "$path" != /* || "$path" == *$'\r'* || "$path" == *$'\n'* ]]; then
    exit 64
fi

# Bash provides /dev/tcp without adding a network client package to the runtime
# image. Compose still applies its own five-second timeout to the whole probe.
exec 3<>"/dev/tcp/127.0.0.1/${port}"
printf 'GET %s HTTP/1.1\r\nHost: 127.0.0.1\r\nConnection: close\r\n\r\n' "$path" >&3

IFS=$'\r' read -r -t 2 status <&3
case "$status" in
    'HTTP/1.0 200 '*|'HTTP/1.1 200 '*) ;;
    *) exit 1 ;;
esac