httplug.php

<?php

require __DIR__ . "/vendor/autoload.php";

use Http\Client\Curl\Client as Curl;
use Http\Adapter\React\Client as React;
use Http\Adapter\Guzzle6\Client as Guzzle;
use Http\Client\Socket\Client as Socket;
use GuzzleHttp\Client as GuzzleClient;
use Http\Message\MessageFactory\DiactorosMessageFactory;
use Http\Message\StreamFactory\DiactorosStreamFactory;
use Psr\Http\Message\ResponseInterface;

$nosuch = (new DiactorosMessageFactory)->createRequest("GET", "http://google.com/nosuch");

$curl = new Curl(new DiactorosMessageFactory, new DiactorosStreamFactory);
$react = new React(new DiactorosMessageFactory);
$guzzle = new Guzzle(new GuzzleClient);
$socket = new Socket(new DiactorosMessageFactory);

unset($promise);
$promise = $guzzle
    ->sendAsyncRequest($nosuch)
    ->then(function (ResponseInterface $response) {
        print "Guzzle async status: ". $response->getStatusCode() . "\n";
        return $response;
    });

try {
    $promise->wait();
    print "Guzzle promise state: " . $promise->getState() . "\n";
} catch (\Exception $exception) {
    print "Guzzle async exception: " . get_class($exception) . "\n";
}

try {
    $response = $guzzle->sendRequest($nosuch);
    print "Guzzle sync status: " . $response->getStatusCode() . "\n";
} catch (\Exception $exception) {
    print "Guzzle sync exception: " . get_class($exception) . "\n";
}

unset($promise);
$promise = $curl
    ->sendAsyncRequest($nosuch)
    ->then(function (ResponseInterface $response) {
        print "CURL async status: ". $response->getStatusCode() . "\n";
        return $response;
    });

try {
    $promise->wait();
    print "CURL promise state: " . $promise->getState() . "\n";
} catch (\Exception $exception) {
    print "CURL async exception: " . get_class($exception) . "\n";
}

try {
    $response = $curl->sendRequest($nosuch);
    print "CURL sync status: " . $response->getStatusCode() . "\n";
} catch (\Exception $exception) {
    print "CURL sync exception: " . get_class($exception) . "\n";
}

unset($promise);
$promise = $react
    ->sendAsyncRequest($nosuch)
    ->then(function (ResponseInterface $response) {
        print "React async status: ". $response->getStatusCode() . "\n";
        return $response;
    });

try {
    $promise->wait();
    print "React promise state: " . $promise->getState() . "\n";
} catch (\Exception $exception) {
    print "React async exception: " . get_class($exception) . "\n";
}

try {
    $response = $react->sendRequest($nosuch);
    print "React sync status: " . $response->getStatusCode() . "\n";
} catch (\Exception $exception) {
    print "React sync exception: " . get_class($exception) . "\n";
}


print "Socket async not supported \n";

try {
    $response = $socket->sendRequest($nosuch);
    print "Socket sync status: " . $response->getStatusCode() . "\n";
} catch (\Exception $exception) {
    print "Socket sync exception: " . get_class($exception) . "\n";
}

/*

$ php --version
PHP 7.0.11 (cli) (built: Sep 23 2016 20:33:19) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.11, Copyright (c) 1999-2016, by Zend Technologies
    with Xdebug v2.4.1, Copyright (c) 2002-2016, by Derick Rethans

$ php httplug.php
Guzzle async exception: Http\Client\Exception\HttpException
Guzzle sync exception: Http\Client\Exception\HttpException
CURL async status: 404
CURL promise state: fulfilled
CURL sync status: 404
React async status: 404
React promise state: fulfilled
React sync status: 404
Socket async not supported
Socket sync status: 404

*/