Serves the swagger resource listing, which looks like that:
{
"apiVersion":"0.2",
"swaggerVersion":"1.1",
"basePath":"http://petstore.swagger.wordnik.com/api",
"apis":[
{
"path":"/api-docs.{format}/user",
"description":""
},
{
"path":"/api-docs.{format}/pet",
"description":""
}
]
}