After one-week investigation that includes testing and tracing with Extrace, I found that the Cowboy http server hung from a random time point due to an unknown reason, the subsequent requests were rejected in somewhere whether it is a GET request or a POST request, even a GET / request for the home page. The “This site can’t be reached” message was shown in a browser. Tracing indicates that handling stops before going into the router. Such hanging lasts in some cases for a short time such as 5 mins, in other cases for a long time such as 40 mins. After hanging the system works again. What magic can break the Cowboy down? Is it ETS?
