0

设想

我在 nodejs 上运行一个非常简单的服务器：

var http = require("http");
var ConnectionsNumber = 0;

function onRequest(request, response)
{
    console.log((new Date).toUTCString() + " - Request received");
    console.log(request.headers);
    response.writeHead(200, {"Content-Type": "text/plain"});
    response.write("Listening\n");
    response.end();
    ConnectionsNumber++;
    console.log('Requests so far: ' + ConnectionsNumber);
}

http.createServer(onRequest).listen(8888);
console.log((new Date).toUTCString() + " - Server started");

但是当我启动服务器并发出请求（通过 Chrome）时，服务器一次收到两个请求。这是日志：

Wed, 03 Oct 2012 16:03:27 GMT - Server started
Wed, 03 Oct 2012 16:03:34 GMT - Request received
{ host: 'localhost:8888',
  connection: 'keep-alive',
  'cache-control': 'max-age=0',
  'user-agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/537.4',
  accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'accept-encoding': 'gzip,deflate,sdch',
  'accept-language': 'it-IT,it;q=0.8,en-US;q=0.6,en;q=0.4',
  'accept-charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3' }
Requests so far: 1
Wed, 03 Oct 2012 16:03:34 GMT - Request received
{ host: 'localhost:8888',
  connection: 'keep-alive',
  accept: '*/*',
  'user-agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/537.4',
  'accept-encoding': 'gzip,deflate,sdch',
  'accept-language': 'it-IT,it;q=0.8,en-US;q=0.6,en;q=0.4',
  'accept-charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3' }
Requests so far: 2

问题

怎么了？

编辑

这是获胜者：

var http = require("http");
var ConnectionsNumber = 0;

function onRequest(request, response)
{
    console.log((new Date).toUTCString() + " - Request received");
    console.log(request.url);

    response.writeHead(200, {"Content-Type": "text/plain"});
    response.write("Listening\n");
    response.end();

    ConnectionsNumber++;
    console.log('Requests so far: ' + ConnectionsNumber);
}

http.createServer(onRequest).listen(8888);
console.log((new Date).toUTCString() + " - Server started");

以及相应的日志：

Wed, 03 Oct 2012 20:00:04 GMT - Server started
Wed, 03 Oct 2012 20:00:14 GMT - Request received
/
Requests so far: 1
Wed, 03 Oct 2012 20:00:14 GMT - Request received
/favicon.ico
Requests so far: 2

这就是所有人。

4

1 回答 1

4

默认情况下，Chrome 会请求一个网站图标。这可能就是您看到第二个请求的原因。

于 2012-10-03T15:55:51.930 回答