@Override
    void onChange(@Nullable AsciiString name) {
        // This method could be called before the 'cache' field is initialized.
        //noinspection ConstantValue
        if (cache == null || cache.isEmpty()) {
            return;
        }

        cache.remove(name);
    }
Creates a deep copy of the specified {@link HttpHeaderGetters}.
core/src/main/java/com/linecorp/armeria/common/HttpHeadersBase.java