Clone this git repo and use sbt run to start the Spray Can server.
Uses swagger-spray which is built using swagger.io libs.
Test using http://petstore.swagger.io/ and replace the swagger.json with http://localhost:12345/api-docs/swagger.json
The Swagger UI can be used to send sample requests. In my testing, the Add service fails when called from the Swagger UI but the curl command that it produces is displayed and does work when used from the command line. These issues appear to be CORS related.