type net/http.CloseNotifier

3 uses

	net/http (current package)
		http2.go#L162: 	_ CloseNotifier   = http2ResponseWriter{}
		server.go#L218: type CloseNotifier interface {

	net/http/httputil
		reverseproxy.go#L420: 	} else if cn, ok := rw.(http.CloseNotifier); ok {

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