use GuzzleHttp\Client; $client = new GuzzleHttp\Client(); $client->setDefaultOption('timeout', 5);
use GuzzleHttp\Client; $client = new GuzzleHttp\Client(); $client->setDefaultOption('headers', ['X-API-Key' => '12345']);The GuzzleHttp\Client setDefaultOption method is part of the GuzzleHttp package library.