@Override
    public boolean supportsRequestAttributes() {
        return true;
    }
Returns {@code true} because Armeria supports {@link RequestAttribute}. The attributes can be accessed
in the Armeria decorators using {@link RequestAttributeAccess#get(ClientRequestContext, String)}.
spring/spring6/src/main/java/com/linecorp/armeria/spring/client/ArmeriaHttpExchangeAdapter.java