如何在guzzle中应用这段curl代码？

use GuzzleHttp\Client;

$client = new Client();

$request = $client->request('GET', 'https://example.com');

$request = $client->request('GET', 'https://example.com', [
    'headers' => [
        'User-Agent' => 'My User Agent',
        'Accept'     => 'application/json',
    ]
]);

$request = $client->request('POST', 'https://example.com', [
    'body' => 'Hello, World!'
]);

$request = $client->request('GET', 'https://example.com', [
    'timeout' => 5, // 设置超时时间为5秒
    'proxy'   => 'http://proxy.example.com:8080' // 设置代理
]);

$response = $client->send($request);
$body = $response->getBody()->getContents();