How do I open a OAuth2 login page from DialogFlow bot?

Clash Royale CLAN TAG#URR8PPP
How do I open a OAuth2 login page from DialogFlow bot?
I am trying to build a bot using DialogFlow which asks the user to authenticate using OAuth2. I have my server deployed to heroku and I have set up a sample webhook which can call my server and the response is received back to my bot. This works fine.
Now, I want to call my authentication route on the server which opens a login webpage, once the user types in their username/password I would like to authenticate the user and send the response back to the bot along with the token.
What happens currently when I use res.redirect("/myauthroute") is that the user is not taken to the login page, even though my route is called from the bot.
res.redirect("/myauthroute")
I hope that makes sense...
Thanks for the help!
res.redirect()
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Can you show the code you're using in the dialogflow portion? what is calling
res.redirect()?– Prisoner
Aug 7 at 17:30