cookbook: apply review suggestions from #443 (#467)

Log "read" on the read path of the net websocket example (the docs
page renders this file), and use a deferred server.Close() in its test,
matching the gorilla test.

Follow-up to #443 by @wakqasahmed.

Claude-Session: https://claude.ai/code/session_01QKDYQr53zNKkR7nif2CAAq

Author: vishr

cookbook/websocket/net/server.go

@@ -22,7 +22,7 @@ func hello(c *echo.Context) error {
 			// Read
 			msg := ""
 			if err := websocket.Message.Receive(ws, &msg); err != nil {
-				c.Logger().Error("failed to write WS message", "error", err)
+				c.Logger().Error("failed to read WS message", "error", err)
 				return
 			}
 			fmt.Printf("%s\n", msg)

cookbook/websocket/net/server_test.go

@@ -22,20 +22,19 @@ func TestHelloReturnsAfterClientDisconnect(t *testing.T) {
 	})
 
 	server := httptest.NewServer(e)
+	defer server.Close()
+
 	wsURL := "ws" + strings.TrimPrefix(server.URL, "http") + "/ws"
 	ws, err := websocket.Dial(wsURL, "", server.URL)
 	if err != nil {
-		server.Close()
 		t.Fatalf("failed to connect websocket client: %v", err)
 	}
 	if err := ws.Close(); err != nil {
-		server.CloseClientConnections()
 		t.Fatalf("failed to close websocket client: %v", err)
 	}
 
 	select {
 	case <-handlerReturned:
-		server.Close()
 	case <-time.After(2 * time.Second):
 		t.Fatal("websocket handler did not return after client disconnected")
 	}