Drest\Query\ExposeFields::configurePullRequest PHP Method

    public function configurePullRequest(array $requestOptions, Request $request)
    {
        if (empty($this->route_expose)) {
            $exposeString = '';
            foreach ($requestOptions as $requestOption => $requestValue) {
                switch ($requestOption) {
                    case Configuration::EXPOSE_REQUEST_HEADER:
                        $exposeString = $request->getHeaders($requestValue);
                        break;
                    case Configuration::EXPOSE_REQUEST_PARAM:
                        $exposeString = $request->getParams($requestValue);
                        break;
                    case Configuration::EXPOSE_REQUEST_PARAM_GET:
                        $exposeString = $request->getQuery($requestValue);
                        break;
                    case Configuration::EXPOSE_REQUEST_PARAM_POST:
                        $exposeString = $request->getPost($requestValue);
                        break;
                }
            }
            if (!empty($exposeString)) {
                $requestedExposure = $this->parseExposeString($exposeString);
                $this->filterRequestedExpose($requestedExposure, $this->fields);
                $this->fields = $requestedExposure;
            }
        }
        return $this;
    }