public ClientCacheControlBuilder onlyIfCached(boolean onlyIfCached) {
        this.onlyIfCached = onlyIfCached;
        return this;
    }
Enables or disables the {@code "only-if-cached"} directive.

@param onlyIfCached {@code true} to enable or {@code false} to disable.
core/src/main/java/com/linecorp/armeria/common/ClientCacheControlBuilder.java