constructor(
    /**
     * The next policy in the pipeline. Each policy is responsible for executing the next one if the request is to continue through the pipeline.
     */
    _nextPolicy, 
    /**
     * The options that can be passed to a given request policy.
     */
    _options) {
        this._nextPolicy = _nextPolicy;
        this._options = _options;
    }
The main method to implement that manipulates a request/response.