ColdFusion's CFOAUTH Tag
Briefly

The most important aspect is that the tag handles the redirect flow for you automatically. What that means is - on a page with <cfoauth>, the user is automatically redirected. This is important to know as you'll want to use the tag on a page with no UI, one that is loaded when a user wants to login.
The tag will also handle responding to the return from the auth provider by automatically getting the access token (on a good result of course).
Read at Raymondcamden
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