我已经测试了几个库(workerman 和 PHP-Websockets)，但在所有情况下我都遇到了同样的问题 - 当我打开客户端页面时一切正常，我与我的服务器建立了 websocket 连接，但稍后它断开连接几分钟或更短时间内自动。它是已知问题还是有任何方法可以处理它？或者我应该简单地实现一些功能以在 websocket 失败时强制重新连接？
这是workerman的代码示例
服务器 test_ws.php
<?php
require_once '/home/ubuntu/workspace/workerman/vendor/autoload.php';
use Workerman\Worker;
// Create a Websocket server
$ws_worker = new Worker("websocket://0.0.0.0:8082");
// 6 processes
$ws_worker->count = 6;
// Emitted when new connection come
$ws_worker->onConnect = function($connection)
{
echo "New connection\n";
$connection->send('Hello from server');
};
// Emitted when data received
$ws_worker->onMessage = function($connection, $data)
{
// Send hello $data
$connection->send('Data from server: ' . $data);
};
// Emitted when connection closed
$ws_worker->onClose = function($connection)
{
echo "Connection closed\n";
};
// Run worker
Worker::runAll();
和客户端client.html
var socket = new WebSocket("wss://example.com:8082");
socket.onopen = function() {
console.log("Connected.");
};
socket.onclose = function(event) {
if (event.wasClean) {
console.log('Connection closed');
} else {
console.log('Connection failure');
}
console.log('Code: ' + event.code + ' Reason: ' + event.reason);
};
socket.onmessage = function(event) {
console.log("Data received: " + event.data);
};
socket.onerror = function(error) {
console.log("Error: " + error.message);
};
function send() {
socket.send("Hello!");
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Workerman Sockets Test</title>
</head>
<body>
<h3>Hello</h3>
<button onclick="send()">Send Message</button>
</body>
</html>所以，首先我启动 apache 服务器，然后通过控制台运行我的 websocket 脚本，websocket 服务器启动正常。然后我打开我的客户端网页，websocket 连接也建立得很好，但如果我等待大约 1 分钟或更短时间，它会无缘无故地失败。如何建立永久的 websocket 连接？任何建议将不胜感激。谢谢!
服务器
客户端
最佳答案
写在this article : “在建立 websocket 连接的情况下，服务器或防火墙可能会在一段时间不活动后超时并终止连接。”
这就是解决方案!
修改后的客户端页面:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Workerman Sockets Test</title>
</head>
<body>
<h3>Hello</h3>
<button onclick="send()">Send Message</button>
<script type="text/javascript">
var socket = new WebSocket("wss://example.com:8082");
var timerID = 0;
function keepAlive() {
var timeout = 20000;
if (socket.readyState == socket.OPEN) {
socket.send('');
}
timerId = setTimeout(keepAlive, timeout);
}
function cancelKeepAlive() {
if (timerId) {
clearTimeout(timerId);
}
}
socket.onopen = function() {
console.log("Connected.");
document.body.innerHTML += "<p>Connected.</p>";
keepAlive();
};
socket.onclose = function(event) {
if (event.wasClean) {
console.log('Connection closed');
document.body.innerHTML += "<p>Connection closed</p>";
} else {
console.log('Connection failure');
document.body.innerHTML += "<p>Connection failure</p>";
}
console.log('Code: ' + event.code + ' Reason: ' + event.reason);
document.body.innerHTML += "<p>Code: " + event.code + " Reason: " + event.reason + "</p>";
cancelKeepAlive();
};
socket.onmessage = function(event) {
console.log("Data received: " + event.data);
document.body.innerHTML += "<p>Data received: " + event.data + "</p>";
};
socket.onerror = function(error) {
console.log("Error: " + error.message);
document.body.innerHTML += "<p>Error: " + event.message + "</p>";
cancelKeepAlive();
};
function send() {
socket.send("Hello");
}
</script>
</body>
</html>
希望对大家有所帮助。
关于javascript - PHP websocket 断开连接问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48932232/