Laravel guzzlehttp - 如何检查主机是否在线？

Question

当我尝试连接到离线或不存在的主机时，出现异常：

cURL error 6: Could not resolve host: somedomain.com

那么你如何使用这些东西呢？ (https://laravel.com/docs/8.x/http-client)

$response->body() : string;
$response->json() : array|mixed;
$response->status() : int;
$response->ok() : bool;
$response->successful() : bool;
$response->failed() : bool;
$response->serverError() : bool;
$response->clientError() : bool;
$response->header($header) : string;
$response->headers() : array;

我需要知道主机是否在线/离线。

编辑：

use Illuminate\Support\Facades\Http;
use GuzzleHttp\Exception\RequestException;


public function checkSiteStatus($host)
{
    try {
        return Http::timeout(2)->get($host);
    } catch (RequestException $e) {
        //Access the message or other type of errors and react to them

        if (!$e->hasResponse()) {
            //No response from server. Assume the host is offline or server is overloaded.
            return 'offline';
        }
        
        return 'offline';
    }
}

它对我不起作用，我总是得到：cURL 错误 6：无法解析主机：somedomain.com

Answer 1

Guzzle HTTP 客户端抛出了一组异常。 可以从异常中得到响应。

http://docs.guzzlephp.org/en/stable/quickstart.html#exceptions

use GuzzleHttp\Exception\RequestException;

try {
    $client->request('GET', 'https://github.com/_abc_123_404');
} catch (RequestException $e) {
    //Access the message or other type of errors and react to them
    $e->getMessage();
    if (! $e->hasResponse()) {
        //No response from server. Assume the host is offline or server is overloaded.
    }
}

Answer 2

如果你想使用超时，那么我可以通过使用 guzzlehttp 来提供一个选项。

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


public function checkSiteStatus($host)
{
    define("read_timeout", \GuzzleHttp\RequestOptions::READ_TIMEOUT );
    try {
        $client = new Client();
        $response = $response = $client->get(
                $host, [
                'headers' => [
                    // your headers if any
                ],
                'stream' => true,
                'read_timeout' => 2,
            ]);
        $body = $response->getBody();

       // Returns false on timeout
       $data = $body->read(1024);
       // Returns false on timeout
       $line = fgets($body->detach());
       // you can use $data or $line if they are false means there is timeout.
    } catch (RequestException $e) {
        //Access the message or other type of errors and react to them
    }
}

您可以在docs 中阅读有关它们的更多信息。