withAPI

val api = install(OpenAPIGen)  { ... }
...
// StatusPage interop, can also define exceptions per-route
install(StatusPages) {
    withAPI(api) {
        exception<JsonMappingException, Error>(HttpStatusCode.BadRequest) {
            it.printStackTrace()
            Error("mapping.json", it.localizedMessage)
        }
        exception<ProperException, Error>(HttpStatusCode.BadRequest) {
            it.printStackTrace()
            Error(it.id, it.localizedMessage)
        }
    }
}