@Override
    @Nullable
    public Boolean isResponseStreaming(Type returnType, @Nullable MediaType produceType) {
        for (ResponseConverterFunction function : functions) {
            final Boolean responseStreaming = function.isResponseStreaming(returnType, produceType);
            if (responseStreaming != null) {
                return responseStreaming;
            }
        }
        return null;
    }
A {@link ResponseConverterFunction} which wraps a list of {@link ResponseConverterFunction}s.
core/src/main/java/com/linecorp/armeria/internal/server/annotation/CompositeResponseConverterFunction.java