private static HttpHeaders responseHeaders(Method method, Class<?> clazz, String classAlias,
                                               String methodAlias) {
        final HttpHeadersBuilder defaultHeaders = HttpHeaders.builder();
        setAdditionalHeader(defaultHeaders, clazz, "header", classAlias, "class", AdditionalHeader.class,
                            AdditionalHeader::name, AdditionalHeader::value);
        setAdditionalHeader(defaultHeaders, method, "header", methodAlias, "method", AdditionalHeader.class,
                            AdditionalHeader::name, AdditionalHeader::value);
        return defaultHeaders.build();
    }
Returns a list of {@link AnnotatedService} instances. A single {@link AnnotatedService} is
created per each {@link Route} associated with the {@code method}.
core/src/main/java/com/linecorp/armeria/internal/server/annotation/AnnotatedServiceFactory.java