如何使用postman测试接口webservice？

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var ws = new WebSocket(“ws://echo.websocket.org”);

ws.onopen = function(){ws.send(“Test!”); };

ws.onmessage = function(evt){console.log(evt.data);ws.close();};

ws.onclose = function(evt){console.log(“WebSocketClosed!”);};

ws.onerror = function(evt){console.log(“WebSocketError!”);};