Sec-WebSocket-Accept not found.

```
onWorkerStart = function () {
// Websocket protocol for client.
$ws_connection = new AsyncTcpConnection('ws://ws.postman-echo.com/socketio');
$ws_connection->transport = 'ssl';

$ws_connection->onConnect = function ($connection) {
$connection->send('Hi');
};

$ws_connection->onMessage = function ($connection, $data) {
echo "Recv: $data\n";
};
$ws_connection->onError = function ($connection, $code, $msg) {
echo "Error: $msg\n";
};
$ws_connection->onClose = function ($connection) {
echo "Connection closed\n";
};
$ws_connection->connect();
};

Worker::runAll();
```
Response:
```
$ php workerman.php
----------------------- WORKERMAN -----------------------------
Workerman version:4.1.4 PHP version:8.1.6
------------------------ WORKERS -------------------------------
worker listen processes status
none none 1 [ok]
Sec-WebSocket-Accept not found. Header:
HTTP/1.1 403 Forbidden
Date: Thu, 10 Nov 2022 15:06:16 GMT
Content-Type: text/html
Content-Length: 146
Connection: keep-alive
Server: tv
Connection closed
```

Run the provided workerman.php example and inspect AsyncTcpConnection's WebSocket handshake against ws.postman-echo.com/socketio. Determine whether the 403 is an endpoint rejection or a client parsing issue; done is a reproducible diagnosis and a narrowly scoped fix or documentation update with a verified connection.

Written by the indexing model from the issue text.