异常getaddrinfo enotfound

在看NodeJS开发指南这本书时,书中的一个例子,讲解http.request的.代码如下:

 var http = require('http');
 var querystring = require('querystring');
 var contents = querystring.stringify({
 name: 'byvoid',
 email: 'byvoid@byvoid.com',
 address: 'Zijing 2#, Tsinghua University',
 });
 var options = {
 host: 'www.byvoid.com',
 path: '/application/node/post.php',
 method: 'POST',
 headers: {
 'Content-Type': 'application/x-www-form-urlencoded',
 'Content-Length' : contents.length
 }
 };
 var req = http.request(options, function(res) {
 res.setEncoding('utf8');
 res.on('data', function (data) {
 console.log(data);
 });
 });
 req.write(contents);
 req.end();

在运行时会出现以下的error:

events.js:72
    throw er;// Unhandled 'error' event
          ^
Error: getaddrinfo ENOTFOUND
    at errnoException (dns.js:37:11)
    at Object.onanswer [as oncomplete](dns.js:124:16)

随后,查看了官方关于http.request的函数说明.

将代码host: 'www.byvoid.com',修改为 hostname:url.parse( 'www.byvoid.com').hostname.

即可成功运行.