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Canvas App Hosting issue in Chatter

I am working through steps mentioned in Salesforce1 Mobile Developer Guide and stuck at a point where I need to host and run the canvas app in chatter.
All config steps are done and I am getting an error within chatter when trying to run the app.

The error (displayed in pop up) is:

First make HTTP POST to "/" w/ Salesforce signed-request. HTTP GET to "/" is not allowed.

I was able to find 1 post on the internet relating to this problem but the solution was domain enabling which I already have done long back. So that is not the solution. Looking up possible solutions to this problem.