<?php
header('Content-Type: text/plain; charset=utf-8');
echo "REQUEST_METHOD: " . $_SERVER['REQUEST_METHOD'] . "\n";
echo "CONTENT_TYPE: " . $_SERVER['CONTENT_TYPE'] . "\n";
echo "CONTENT_LENGTH: " . $_SERVER['CONTENT_LENGTH'] . "\n";
echo "\nHEADERS:\n";
foreach (getallheaders() as $name => $value) {
    echo "$name: $value\n";
}
echo "\nRAW INPUT:\n" . file_get_contents('php://input') . "\n";
?>