"opaque" is missing during use Digest Web request.

Hi experts,
When I set up a Nav server environment in a VM and set authentication method as "UserName". When I send the web request, the server respond with
"Digest qop="auth",algorithm=MD5-sess,nonce="+Upgraded+v1bf662ec1815d6f6752d81038323ceca171e594efd392d4013f5ecd15009e16908d175b053a8741d44c753dc755b14022819a3c9b25366fc7",charset=utf-8,realm="Digest""

However, there is no "opaque" in the response, and I tried resend the request based on "Digest" rule both in my code and postman. Always return 401 Unauthorized error. Is that caused by missing "opaque" or I have some steps missing?
Thank in advance.