Given that path parameter must be required according to the OpenAPI/Swagger spec, you can consider adding 2 separate endpoints with the following paths:
/get/{param1}/{param2}when param2 is provided/get/{param1}/when param2 is not provided
Given that path parameter must be required according to the OpenAPI/Swagger spec, you can consider adding 2 separate endpoints with the following paths:
/get/{param1}/{param2} when param2 is provided/get/{param1}/ when param2 is not provided