 into <code><a href="../Classes/BaseRequest.html#/s:4TRON11BaseRequestC10parametersSDySSypGvp">parameters</a></code> variable on request. If <code>rootKey</code> is non-nil, parameters are wrapped in external dictionary and set into <code><a href="../Classes/BaseRequest.html#/s:4TRON11BaseRequestC10parametersSDySSypGvp">parameters</a></code> using <code>rootKey</code> as a single key.
If <code>setNilToNull</code> is set to true, every nil value will be converted to <code>NSNull</code> instance.</p>

       