Passport Redirect Loop

The code here implements Facebook authentication using the examples provided by Passport.js. Though the examples were followed, the code results in an infinite loop of HTTP redirects. What has been overlooked that would cause this issue?

Here's What Happens

First, we get the server up and running:

npm install
foreman start

Then, we hit the /auth/facebook endpoint. As expected, this sends us to Facebook to login, and redirects us back to the /auth/facebook/callback route when completed.

passport-redirect-loop(master) » http 0.0.0.0:5000/auth/facebook

HTTP/1.1 302 Moved Temporarily
Connection: keep-alive
Content-Length: 0
Date: Mon, 05 May 2014 02:08:20 GMT
Location: https://www.facebook.com/dialog/oauth?response_type=code&redirect_uri=http%3A%2F%2F0.0.0.0%3A5000%2Fauth%2Ffacebook%2Fcallback&scope=read_stream&client_id=123456789ABCDEF

However, when we hit the /auth/facebook/callback route, we're redirected back to Facebook again! The cycle continues, and we loop infinitely.

passport-redirect-loop(master) » http 0.0.0.0:5000/auth/facebook/callback

HTTP/1.1 302 Moved Temporarily
Connection: keep-alive
Content-Length: 0
Date: Mon, 05 May 2014 02:14:08 GMT
Location: https://www.facebook.com/dialog/oauth?response_type=code&redirect_uri=http%3A%2F%2F0.0.0.0%3A5000%2Fauth%2Ffacebook%2Fcallback&client_id=123456789ABCDEF

The code for handling each of these routes is straight out of the Passport documentation. What is missing from the documentation's example that would prevent this from happening?

blackcoat/passport-redirect-loop

Passport Redirect Loop

Here's What Happens