Problem creating Facebook application with heroku

I am trying to create a canvas Facebook application.

I have created Heroku application written in ruby via Faceb开发者_如何学Goook.

Creating the application I followed the steps of these guides:

http://devcenter.heroku.com/articles/facebook

http://devcenter.heroku.com/articles/configuring-your-facebook-app-as-a-canvas-page

After following these steps when I go to the application it says

Not Found

When I put it in Facebook's Object Debugger it says:

Extraneous Property - Objects of this type do not allow properties named og:site_url.

How can I fix this?

Thanks,

Oded

---

The canvas app POST's to '/'.

The heroku template is expecting GET.

See the following to accept both GET and POST's: http://ujihisa.blogspot.com/2009/11/accepting-both-get-and-post-method-in.html

Change

get '/' do ...

to...

def get_or_post(path, opts={}, &block)
  get(path, opts, &block)
  post(path, opts, &block)
end

get_or_post '/' do...