I was writing a Facebook Canvas App with Flask. Then I decided to move my frontend to AngularJS. I wanted to put the AngularJS static code to a static hosting provider to avoid higher costs. Nevertheless, I realized that I had forgotten that I can't handle POST requests by AngularJS since it doesn't have a dynamic server.
Facebook Canvas performs a POST request with signed_request parameter to your homepage and you should handle that parameter to see who the logged user is.
What I did was: create a Node.JS app with express.js framework. Convert homepage to view, add a hidden input field in the HTML code and handle POST parameter by Node.JS, filling that hidden input.
When I did this, facebook posted the signed_request parameter and I placed that code into the hidden field. Now AngularJS code can post that signed_request code to the backend API server to process it or use it client-side.
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