Set proxy in Guzzle

Question

I have a problem with set proxy in guzzle that a blank page was shown while with curl everything works perfect. The code that I used in guzzle and curl came below. What is wrong with this code: Guzzle:

use GuzzleHttp\Client;
use GuzzleHttp\Exception\RequestException;

require_once "vendor/autoload.php";

try {
  $client = new Client();
  $request = new \GuzzleHttp\Psr7\Request('GET', 'http://httpbin.org');
  $response = $client->send($request, [
      'timeout'  => 30,
      'curl'  => [
          'CURLOPT_PROXY' => '*.*.*.*',
          'CURLOPT_PROXYPORT' => *,
          'CURLOPT_PROXYUSERPWD' => '*:*',
      ],

  ]);
  echo '</pre>';
  echo($response->getBody());
  exit;
} catch (RequestException $e) {
  echo $e->getRequest();
  if ($e->hasResponse()) {
      echo $e->getResponse();
  }
}

And The code with CURL:

$url = 'http://httpbin.org';
$ch = curl_init($url);
curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13');
curl_setopt($ch, CURLOPT_PROXY, '*.*.*.*');
curl_setopt($ch, CURLOPT_PROXYPORT, *);
curl_setopt($ch, CURLOPT_PROXYUSERPWD, '*:*');
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$page = curl_exec($ch);
echo $page;

Thanks.

Answer 1

As for Guzzle 6.

Guzzle docs give info about setting proxy for a single request

$client->request('GET', '/', ['proxy' => 'tcp://localhost:8125']);

But you can set it to all requests when initializing client

    $client = new Client([
        'base_uri' => 'http://doma.in/',
        'timeout' => 10.0,
        'cookie' => true,
        'proxy' => 'tcp://12.34.56.78:3128',
    ]);

UPD. I don't know why, but I face a strange behaviour. One server with guzzle version 6.2.2 works great with config as above, and the other one with the same version receives 400 Bad Request HTTP error from a proxy. It is solved with another config structure (found in docs for guzzle 3)

$client = new Client([
    'base_uri' => 'http://doma.in/',
    'timeout' => 10.0,
    'cookie' => true,
    'request.options' => [
        'proxy' => 'tcp://12.34.56.78:3128',
    ],
]);