[英]Response.write() not returning value
我一直在关注本教程 ,以获取有关nodejs的介绍,但是我在使用response.write()返回某些内容时遇到了麻烦。
当我转到domain:8001时,我的server.js代码可以很好地返回“ hello world”,但导航至domain:8001 / socket.html会返回黑屏。
我使用console.log来检查写“ socket在这里”的代码。 正在执行,但我不确定为什么它什么也没做。
server.js:
var http = require("http");
var url = require('url');
var fs = require('fs');
var server = http.createServer(function(request, response){
console.log('Connection');
var path = url.parse(request.url).pathname;
console.log(__dirname);
console.log(path);
switch(path){
case '/':
response.writeHead(200, {'Content-Type': 'text/html'});
response.write('hello world');
break;
case '/socket.html':
fs.readFile(__dirname + path, function(error, data){
if (error){
response.writeHead(404);
response.write("opps this doesn't exist - 404");
}
else{
response.writeHead(200, {"Content-Type": "text/html"});
response.write("socket is here.");
}
});
break;
default:
response.writeHead(404);
response.write("opps this doesn't exist - 404");
break;
}
response.end();
});
server.listen(8001);
var io = require('socket.io').listen(server);
socket.html :(尽管其中包含什么无关紧要)
<html>
<head>
<script src="/socket.io/socket.io.js"></script>
</head>
<body>
<script>
var socket = io.connect();
</script>
<div>This is our socket.html file</div>
</body>
</html>
您正在等待fs.readFile()
完成之前结束响应。 尝试这个:
var http = require("http");
var url = require('url');
var fs = require('fs');
var server = http.createServer(function(request, response){
console.log('Connection');
var path = url.parse(request.url).pathname;
console.log(__dirname);
console.log(path);
switch(path){
case '/':
response.writeHead(200, {'Content-Type': 'text/html'});
response.write('hello world');
break;
case '/socket.html':
fs.readFile(__dirname + path, function(error, data){
if (error){
response.writeHead(404);
response.write("opps this doesn't exist - 404");
}
else{
response.writeHead(200, {"Content-Type": "text/html"});
response.write("socket is here.");
}
response.end();
});
return;
default:
response.writeHead(404);
response.write("opps this doesn't exist - 404");
break;
}
response.end();
});
server.listen(8001);
var io = require('socket.io').listen(server);
另外,做fs.readFile(__dirname + path, ...);
这是潜在的危险,因为有人可以发送类似/../../../../../../etc/passwd
的请求。 相反,您应该在其中使用path
模块将__dirname + path
解析/归一__dirname + path
绝对路径,然后确保该绝对路径以您的公共目录的绝对路径开头。
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