VCR\Request::setHeader PHP Method

    public function setHeader($key, $value)
    {
        $this->headers[$key] = $value;
    }

 /**
  * Returns a Request from specified stream context and path.
  *
  * If an existing Request is given, the stream context options
  * are set on the specified Request object.
  *
  * @param resource $context Stream context resource.
  * @param string $path Path to use as url.
  * @param Request $existing Optional, existing request.
  *
  * @return Request
  */
 public static function createRequestFromStreamContext($context, $path, Request $existing = null)
 {
     $http = self::getHttpOptionsFromContext($context);
     $request = $existing;
     if (empty($request)) {
         $method = !empty($http['method']) ? $http['method'] : 'GET';
         $request = new Request($method, $path, array());
     }
     if (!empty($http['header'])) {
         $headers = HttpUtil::parseHeaders(HttpUtil::parseRawHeader($http['header']));
         foreach ($headers as $key => $value) {
             $request->setHeader($key, $value);
         }
     }
     if (!empty($http['content'])) {
         $request->setBody($http['content']);
     }
     if (!empty($http['user_agent'])) {
         $request->setHeader('User-Agent', $http['user_agent']);
     }
     if (isset($http['follow_location'])) {
         $request->setCurlOption(CURLOPT_FOLLOWLOCATION, (bool) $http['follow_location']);
     }
     if (isset($http['max_redirects'])) {
         $request->setCurlOption(CURLOPT_MAXREDIRS, $http['max_redirects']);
     }
     if (isset($http['timeout'])) {
         $request->setCurlOption(CURLOPT_TIMEOUT, $http['timeout']);
     }
     // TODO: protocol_version
     return $request;
 }