How do I send a HTTP/2 POST request in PHP

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The CURL extension for PHP >= 5.5.24 has support for HTTP/2. (since this commit)

You also need a libcurl installed — the underlying library that the curl functions use — with HTTP/2 support enabled. That means a libcurl newer than 7.38.0 but really, the newer the better. Libcurl has to have been built with HTTP/2 support explicitly enabled, using the --with-nghttp2 flag at compile time.

Just use curl as you’d normally use it, and set the CURLOPT_HTTP_VERSION option to use HTTP/2 by passing in CURL_HTTP_VERSION_2_0. Then you’ll get the request upgraded to version 2 if the client and server both support it.

Prior to PHP 5.5.24, if libcurl has been built with HTTP/2 support, you can pass in the int value of CURL_HTTP_VERSION_2_0 explicitly as PHP will still pass it through to libcurl. Currently, it has a value of 3 — this should not change, but could.

if (!defined('CURL_HTTP_VERSION_2_0')) {
    define('CURL_HTTP_VERSION_2_0', 3);
}

$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);

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