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I really don’t understand why do we need to create channel.html file, as mentioned by FB docs. I also want to understand how it is used. In my logs I don’t see this file being ever requested.
The channel file is to provide a way to do cross domain communication between FB’s servers and your own. The reason for this is their tight control over access tokens. You must authenticate a redirect url and app id to retrieve this access token. In order for them to pass you the token, they hit your URL with the access token in the hash. With the Channel URL, they get to pass this token to themselves (their JavaScript running on your domain).
This channel file can then communicate the access token to your active page.
For them to keep all of these things available to only their domain, they need something that works in every browser. Currently, that is a hack of creating popups that are not accessible by javascript running on your server.