How to define an optional parameter in path using swagger

Question

There is a function in my REST web service working with GET method and it has two optional parameters.

I tried to define it in Swagger but I encountered an error, <

Answer 1

Your YAML fails because as it stated on the specification:

Determines whether this parameter is mandatory. If the parameter is in "path", this property is required and its value MUST be true.

Source: http://swagger.io/specification/#parameterObject (Look in fixed fields table)