### 23.2 (8.2) 조건 형제 비교 — 캐시 정책이 두 벌이다

배선된 것:

```java
// filter/CacheControlFilter.java  (24 lines)
@Component
@Order(Ordered.HIGHEST_PRECEDENCE + 20)
public class CacheControlFilter extends OncePerRequestFilter {
  static final String DEFAULT_CACHE_CONTROL = "no-store";
  static final String DEFAULT_VARY = "Accept, Accept-Encoding, Authorization";
  protected void doFilterInternal(...) {
    response.setHeader(ApiHeaders.CACHE_CONTROL, DEFAULT_CACHE_CONTROL);
    response.setHeader(ApiHeaders.VARY, DEFAULT_VARY);
    chain.doFilter(request, response);