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();