Behat : Fonction iRequest d'un fichier Context

ApiContext.php

<?php 

/**
 * @When /^I request "(GET|POST) ([^"]*)"$/
 */
public function iRequest($httpMethod, $resource)
{
    $this->resource = $resource;

    $method = strtolower($httpMethod);

    $this->request = $this->client->$method($resource);

    foreach ($this->headers as $key => $val) {
        $this->request->setHeader($key, $val);
    }

    $this->response = $this->request->send();
}