[英]unable to create simple websocket - NodeJS
我正在嘗試遵循本教程: https ://www.simonewebdesign.it/101-web-socket-protocol-handshake/,用於開發簡單的websocket協議。
我正在訪問localhost:1337/index.html
但得到:
找不到此本地主機頁面
找不到網址的網頁: http:// localhost:1337 / index.html在 Google上搜索localhost 1337索引HTTP錯誤404
如果我訪問此網址: file:///C:/Users/.../websocket-demo/index.html
我至少看到了呈現的index.html頁面。 但是在控制台中,我收到此錯誤:
WebSocket與“ ws:// localhost:1337 /”的連接失敗:連接建立錯誤:net :: ERR_CONNECTION_REFUSED
我不確定是怎么了?
我有3個文件: index.html
, server.js
和client.js
#!/usr/bin/env node
var WebSocketServer = require('websocket').server;
var http = require('http');
var server = http.createServer(function(request, response) {
console.log('Received request from ' + request.url);
response.writeHead(404);
response.end();
});
server.listen(1337, function() {
console.log('Server is listening on port 1337.');
});
wsServer = new WebSocketServer({
httpServer: server,
autoAcceptConnections: false // because security matters
});
function isAllowedOrigin(origin) {
console.log('Connection requested from origin ' + origin);
valid_origins = [
'http://localhost:8080',
'127.0.0.1',
'null'
];
if (valid_origins.indexOf(origin) != -1) {
console.log('Connection accepted from origin ' + origin);
return true;
}
console.log('Origin ' + origin + ' is not allowed.')
return false;
}
wsServer.on('connection', function(webSocketConnection) {
console.log('Connection started.');
});
wsServer.on('request', function(request) {
var connection = isAllowedOrigin(request.origin) ?
request.accept('echo-protocol', request.origin)
: request.reject();
connection.on('message', function(message) {
var response = '';
console.log('Received Message: ' + message.utf8Data);
if (message.type === 'utf8') {
switch (message.utf8Data) {
case 'hi':
response = 'Hey there';
break;
case 'hello':
response = 'Heya!';
break;
case 'xyzzy':
response = 'Nothing happens.';
break;
case 'desu':
response = 'Keep typing, man. Keep typing.';
break;
default:
response = "Hello. Uh... what am I supposed to do with '" +
message.utf8Data + "'?";
}
connection.sendUTF(response);
}
});
connection.on('close', function(reasonCode, description) {
console.log(connection.remoteAddress + ' has been disconnected.');
});
});
(function () {
var ws = new WebSocket('ws://localhost:1337', 'echo-protocol');
ws.onopen = function (event) {
console.log('Connection opened.');
}
ws.onmessage = function (event) {
console.log('Response from server: ' + event.data);
}
ws.onclose = function (event) {
console.log('Connection closed.');
}
ws.onerror = function (event) {
console.log('An error occurred. Sorry for that.');
}
WebSocket.prototype.sendMessage = function (message) {
this.send(message);
console.log('Message sent: ' + message);
}
document.getElementById('send').addEventListener('click', function (event) {
event.preventDefault();
var message = document.getElementById('message').value;
ws.sendMessage(message);
});
})();
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>WebSocket Client Demo</title>
</head>
<body>
<h1>WebSocket Client</h1>
<form>
<label for="message">Send a message</label>
<input id="message" name="message" type="text">
<button id="send" name="send">Send</button>
</form>
<script src="client.js"></script>
</body>
</html>
您的網絡服務器不提供index.html
文件。
您可以查看這篇文章 ,以了解如何提供靜態文件,或者您可以啟動另一個HTTP服務器來提供索引文件,例如使用python,這是它們在您遵循的教程的README文件中建議的方式: https://github.com/simonewebdesign/websocket-demo
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