Ergo\Http\Client::_dispatchRequest PHP Method

    private function _dispatchRequest($request)
    {
        // track the number of requests across instances
        self::$requestCount++;
        $timestart = microtime(true);
        $response = self::transport()->send($request);
        // pass the response through the filter chain
        foreach ($this->_filters as $filter) {
            $response = $filter->response($response);
        }
        $httpCode = $response->getStatus()->getCode();
        $location = $response->getHeaders()->value('Location');
        $body = $response->getBody();
        // track the time taken across instances
        self::$requestTime += microtime(true) - $timestart;
        // process a redirect if needed
        if ($httpCode < 400 && $location) {
            return $this->_redirect($location);
        } else {
            $this->_redirects = 0;
        }
        // translate error code to a typed exception
        if ($httpCode == 500) {
            throw new Error\InternalServerError($body);
        } elseif ($httpCode == 400) {
            throw new Error\BadRequest($body);
        } elseif ($httpCode == 401) {
            throw new Error\Unauthorized($body);
        } elseif ($httpCode == 404) {
            throw new Error\NotFound($body);
        } else {
            if ($httpCode >= 300) {
                throw new Error($body, $httpCode);
            }
        }
        return $response;
    }