ShallowEtagHeaderFilter is misconfigured. By default, it will participate in an async dispatch and only update the header once the async dispatch is complete. You haven't configured the filter's dispatcher types so it uses the default of DispatcherType.REQUEST. As a result, the filter is never called when the dispatch completes so it never gets a chance to update the header and write out the response.

If you want the filter to participate in async dispatches, you need to use a FilterRegistrationBean to configure the required dispatcher types. Replace your @Bean method for the filter with something like this:

@Bean
public FilterRegistrationBean<ShallowEtagHeaderFilter> etagFilter() {
    FilterRegistrationBean<ShallowEtagHeaderFilter> registration = new FilterRegistrationBean<>(new ShallowEtagHeaderFilter());
    registration.setDispatcherTypes(EnumSet.of(DispatcherType.REQUEST, DispatcherType.ASYNC));
    return registration;
}

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WebAsyncTask returns empty page/response #18931

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