handlerClass,
this.handlingMethod.getDeclaringClass(),
this.handlingMethod.getReturnType(),
this.handlingMethod.getGenericReturnType());
this.rawResponseType = ctPair.rawClass();
this.responseType = ctPair.type();
if (routingResponseType == null) {
this.routingResponseType = responseType;
this.rawRoutingResponseType = rawResponseType;
} else {
GenericType routingResponseGenericType = new GenericType(routingResponseType);