<?php
$url = $argv[1] ?? 'https://nghttp2.org/httpbin/get';

$version = curl_version();
$featureList = $version['feature_list'] ?? [];
$http2Supported = ($featureList['HTTP2'] ?? false)
    || (defined('CURL_VERSION_HTTP2') && (($version['features'] & CURL_VERSION_HTTP2) !== 0));

echo 'cURL library: ' . $version['version'] . PHP_EOL;
echo 'HTTP/2 feature: ' . ($http2Supported ? 'yes' : 'no') . PHP_EOL;

if (!$http2Supported || !defined('CURL_HTTP_VERSION_2TLS')) {
    fwrite(STDERR, 'This PHP cURL build does not expose HTTP/2 support.' . PHP_EOL);
    exit(1);
}

$curl = curl_init($url);
curl_setopt_array($curl, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_2TLS,
    CURLOPT_TIMEOUT => 15,
    CURLOPT_USERAGENT => 'ExampleHttp2Client/1.0',
]);

$body = curl_exec($curl);
if ($body === false) {
    fwrite(STDERR, 'cURL error: ' . curl_error($curl) . PHP_EOL);
    curl_close($curl);
    exit(1);
}

$status = curl_getinfo($curl, CURLINFO_RESPONSE_CODE);
$httpVersion = curl_getinfo($curl, CURLINFO_HTTP_VERSION);
curl_close($curl);

$versionNames = [];
foreach ([
    'CURL_HTTP_VERSION_1_0' => 'HTTP/1.0',
    'CURL_HTTP_VERSION_1_1' => 'HTTP/1.1',
    'CURL_HTTP_VERSION_2_0' => 'HTTP/2',
    'CURL_HTTP_VERSION_2' => 'HTTP/2',
    'CURL_HTTP_VERSION_2TLS' => 'HTTP/2',
] as $constant => $label) {
    if (defined($constant)) {
        $versionNames[constant($constant)] = $label;
    }
}

$negotiated = $versionNames[$httpVersion] ?? 'unknown';

echo 'HTTP status: ' . $status . PHP_EOL;
echo 'Negotiated protocol: ' . $negotiated . PHP_EOL;

if ($status < 200 || $status >= 300 || $negotiated !== 'HTTP/2') {
    fwrite(STDERR, 'The request did not complete over HTTP/2.' . PHP_EOL);
    exit(1);
}