def base_url_from_schema
      json_schema.links.find do |link|
        if link.href && link.rel == "self"
          return link.href
        end
      end
    end
def base_url_from_schema
      json_schema.links.find do |link|
        if link.href && link.rel == "self"
          return link.href
        end
      end
    end
Extracts the base url of the API from JSON Schema
 @return [String, nil]
 @example
   base_url_from_schema #=> "https://api.example.com/"