SwaggerUI troubles with optional path variables

[DGuidi]

Expected Behavior

swagger definition can be tested directly from swaggerui

Actual Behavior

http url is not valid, as seen also in curl example provided from swaggerui
curl -X GET "https://localhost:9080/v1/gammanext/{verticale?%7D%2FAgenteMG%2F1=" -H "accept: application/json"

Steps to Reproduce the Problem

1. describe a nancy url with optional path variables, i.e: api/v1/{requiredvar}/{optionalvar?}/
2. open swagger document in petstore
3. try a demo request

Specifications

• Version: nancy 2.2.51-alpha and nancy 2.0 cleanteastwood
• Platform: windows 10
• Subsystem: -netcore 2.1