A barebones swagger example, that includes the StopLight extension to instruct Prism to validate and add a response header to all requests.

spec.json

{
	"swagger": "2.0",
	"host": "myapi.com",
	"schemes": ["http"],
	"info": {},
	"paths": {},
	"definitions": {},
	"x-stoplight": {
		"beforeScript": "function(ctx, request) {}",
		"afterScript": "function(ctx, request, response) { // messages contain any warnings or errors var messages = response.validate(); var isValid = response.valid.get(); // Set a header here, so that your testing tools can throw errors appropriately if (isValid) { response.header.set('Validation', 'Passed'); } else { response.header.set('Validation', 'Failed'); } }",
		"mock": {
			"enabled": false,
			"dynamic": false
		},
		"functions": {}
	}
}