// HTTP服务执行入口 func (s *Server) ServeHTTP(r engine.Request, w engine.Response) { var h *echo.Echo app, ok := s.Apps[r.Host()] if !ok || app.Handler == nil { h = s.Core } else { h = app.Handler } if h != nil { h.ServeHTTP(r, w) } else { w.NotFound() } }