A simple realtime chat using Rails and Angularjs

Requirement

Thin/Puma servers or similar
Chrome or Firefox or something else that support SSE natively. However, it looks like some adblocks make SSE connection stalling in "pending" status.

During the development, I noticed some common pitfalls in ActionController::live, I call them 坑 (pronounced as "/kng/")

During development, you have to use either Thin or Puma as server. There might be others but I did not test. WEBrick shipped by default would not work because it's not threaded server.
Make sure you have config.allow_concurrency = true in environments/development.rb. This will remove several Rails global locks that stops requests from being processed.
It's quite interesting that alto ugh AngularJS is using existing jQuery library rather than using its own mocking library, it still requires manual settings for CSRF-Token.

I believe all the three issues will be fixed in Rails soon.