Oauth2 redirect_uri parameter

[ta]

Hello,
I'm trying to achieve oauth2 integration using APS 1.11 in a container and external oauth2 provider. I have oauth2 properties enabled in activiti-app.properties. When I click SSO login on login screen it takes me to following address:

https://example.mockservice.com/login/oauth2/authorize?client_id=abc123&redirect_uri=http://testing.processservices.com/activiti-app/sso/loginsso&response_type=code&state=abc123

External oauth2 provider requires redirect_uri parameter to start with https. 

So the question is, is it possible to change redirect_uri parameter value somewhere (marked in bold)?

[ta]

Anyone knows how to change redirect_uri from http to https?

Is there any property that allows changing the property?

[ta]

I've read other topics on this matter on this forum but still no solution for this. Does anyone know any more in-depth tutorial on how to configure Oauth2 with APS 1.11?