public ServerCacheControlBuilder mustRevalidate(boolean mustRevalidate) {
        this.mustRevalidate = mustRevalidate;
        return this;
    }
Enables or disables the {@code "must-revalidate"} directive.

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