router_b = APIRouter(route_class=APIRouteB)
router_c = APIRouter(route_class=APIRouteC)


@router_a.get("/")
def get_a():
    return {"msg": "A"}


@router_b.get("/")
def get_b():
    return {"msg": "B"}


@router_c.get("/")
def get_c():
    return {"msg": "C"}


router_b.include_router(router=router_c, prefix="/c")
router_a.include_router(router=router_b, prefix="/b")

Some requests will have a cached response. When this cached response isn’t fresh, OkHttp can do a _conditional GET_ to download an updated response if it’s newer than what’s cached. This requires headers like `If-Modified-Since` and `If-None-Match` to be added.

## Rewriting Responses

      Yellow(Red<B> red) {
        red.super();
      }

      Class<?> getClassB() {
        return new TypeToken<B>(getClass()) {}.getRawType();
      }

      Red<A> getA() {
        return getSelfA();
      }

      Red<B> getB() {
        return getSelfB();
      }
    }

    Class<?> getClassDirect() {
      return new TypeToken<A>(getClass()) {}.getRawType();

      Yellow(Red<B> red) {
        red.super();
      }

      Class<?> getClassB() {
        return new TypeToken<B>(getClass()) {}.getRawType();
      }

      Red<A> getA() {
        return getSelfA();
      }

      Red<B> getB() {
        return getSelfB();
      }
    }

    Class<?> getClassDirect() {
      return new TypeToken<A>(getClass()) {}.getRawType();