Server timeout kills SSE example after 30s

[henderb]

When trying the new Server Sent Events example, it seems to work for the first 30 seconds, but the next sent event gets the connection closed, or if you're messing with the time between events, you get a content length error if you haven't sent anything before 30s.

Is there a way to have the default timeout, but let SSE streams be long-running?

[aldas]

@henderb you need to set http.Server.WriteTimeout to 0

	sc := echo.StartConfig{
		Address: ":8080",
		BeforeServeFunc: func(s *http.Server) error {
			s.WriteTimeout = 0 // IMPORTANT: disable for SSE
			return nil
		},
	}
	if err := sc.Start(context.Background(), e); err != nil {
		e.Logger.Error("failed to start server", "error", err)
	}

I will update the example

[aldas]

In next Echo version WriteTimeout = 0 will not be necessary. I made it default.