用PHP发出HTTP/2请求

Question

有没有办法强制PHP与另一台服务器建立HTTP2连接，以查看该服务器是否支持它？

我试过了：

$options = stream_context_create(array(
               'http' => array(
                    'method' => 'GET',
                    'timeout' => 5,
                    'protocol_version' => 1.1
                )
              ));
$res = file_get_contents($url, false, $options);
var_dump($http_response_header);

并尝试：

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTP_VERSION, 3);
$response = curl_exec($ch);
var_dump($response);
curl_close($ch);

但是如果我使用下面的URL https://www.google.com/#q=apache+2.5+http%2F2，这两种方法都会得到HTTP1.1响应

我从启用了HTTP/2 + SSL的域发送请求。我做错了什么？

Answer 1

据我所知，cURL是PHP语言中唯一支持HTTP2.0的传输方法。

您首先需要测试您的cURL版本是否支持它，然后设置正确的版本头：

if (
    defined("CURL_VERSION_HTTP2") &&
    (curl_version()["features"] & CURL_VERSION_HTTP2) !== 0
) {
    $url = "https://www.google.com/";
    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_URL            =>$url,
        CURLOPT_HEADER         =>true,
        CURLOPT_NOBODY         =>true,
        CURLOPT_RETURNTRANSFER =>true,
        CURLOPT_HTTP_VERSION   =>CURL_HTTP_VERSION_2_0,
    ]);
    $response = curl_exec($ch);
    if ($response !== false && strpos($response, "HTTP/2") === 0) {
        echo "HTTP/2 support!";
    } elseif ($response !== false) {
        echo "No HTTP/2 support on server.";
    } else {
        echo curl_error($ch);
    }
    curl_close($ch);
} else {
    echo "No HTTP/2 support on client.";
}