How can we get all parameters in the request?

Hi,

We are using http.request.parameters.name.get("parameter_name", default_value) method to get specified parameter value of a request in endpoints.
How can we get all parameters list in the request?
For example, by using http.request.headerNames method, we can get all header names that are passed with the request. In a similar way, any method available to get all parameter names that are passed with the request.

Your help could be highly appreciated.
Thanks & Regards,
Srujana Satya Datla