Which HTTP status code should I use?

Quick tip for back end developers:
I find myself coming back to http://racksburg.com/choosing-an-http-status-code/ every month to to help me figure out which HTTP status code I should return while building out APIs. The web is littered with verbose explanations of status codes, but I find the simple and clear flow charts in the article to be the easiest way to figure out which code to use.

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