Curl\Curl::setHeader PHP Method

    public function setHeader($key, $value)
    {
        $this->headers[$key] = $value;
        $headers = array();
        foreach ($this->headers as $key => $value) {
            $headers[] = $key . ': ' . $value;
        }
        $this->setOpt(CURLOPT_HTTPHEADER, $headers);
    }

 public function send($url, $method, array $parameters = [], array $postParameters = [], array $header = [], $content = '')
 {
     $this->curl->setOpt(CURLOPT_RETURNTRANSFER, true);
     $this->curl->setOpt(CURLOPT_SSL_VERIFYPEER, false);
     $method = strtolower($method);
     $finalUrl = strpos($url, '//') !== false ? $url : $this->url . $url;
     if (!empty($this->authorization) && empty($header['Authorization'])) {
         $authClass = 'Bennsel\\WindowsAzureCurl\\Service\\Authorization\\' . $this->authorization;
         $class = new $authClass($this->settings);
         $header['Authorization'] = $class->getAuthorizationString($url, $method, $parameters, $header);
     }
     if ($content && is_object($content) && method_exists($content, 'toArray')) {
         $parameters = $content->toArray();
     }
     foreach ($header as $key => $value) {
         $this->curl->setHeader($key, $value);
     }
     $orgHeader = $header;
     $r = $this->curl->{$method}($finalUrl, $parameters ?: $postParameters);
     if ($this->curl->http_status_code == 301) {
         $this->url = $this->curl->response_headers['Location'];
         return $this->send($url, $method, $parameters, $postParameters, $orgHeader, $content);
     }
     return ResponseModelMapping::create($url, $r);
 }