index.html


<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>Proxy Detect</title>
    <style>
        body {
            font-family: monospace;
        }
    </style>
</head>
<body>
<h2>Proxy Detect (TCP Win)</h2>
<div>
    status: <span id="textProxy">...</span>
</div>
<script>
    var buf = new Uint8Array(1024)
    host = window.location.host;
    var ws = new WebSocket("ws://" + host + "/echo")

    console.log('connecting...')


    var tid
    ws.onopen = function() {
        console.log('onopen')
    }
    ws.onmessage = function(e) {
        console.log('onmessage. recv: %d bytes', e.data.length)
        // console.log('start write:', performance.now())
        // tid = setInterval(trace, 1)

        for (let i = 0; i < 1024; i++) {
            send()
        }
        setTimeout(function() {
            textProxy.textContent = !ws.bufferedAmount
        }, 1000)
    }
    ws.onclose = function() {
        console.log('onclose')
        // trace()
        clearInterval(tid)
    }
    ws.onerror = function() {
        console.log('onerror')
    }
    function send() {
        ws.send(buf)
    }
</script>
</body>
</html>