Unable to access Jira OAuth 2.0 with HTTP as base url

[Jamshaid]

I am trying to enable Jira OAuth 2.0 on a Jira Datacenter v 9.1.0. I have followed these instructions.

It always mentions that I need to use HTTPS. Here is my URL:

http://jira-loadb-1usqjsjqhego0-1338266907.us-east-1.elb.amazonaws.com/rest/oauth2/latest/authorize?client_id=CLIENTID&redirect_uri=URL&response_type=code&scope=WRITE&code_challenge=CODE_CHALLENGE&code_challenge_method=S256

I have just updated CLIENTID, scope, and redirect_uri in this URL. All other values are default values.

When I access this URL, it shows the following screen:  

On this URL, it mentions that the base URL is by default set to use HTTP.

But it always shows the above error page. When I put HTTPS in the start, it says,

Hmmm… can't reach this page

Any ideas about what am I missing?

Thanks