Get 请求的相关方法一定在http.ServerRequest下，ServerRequest有data、end、close3个事件，method、url、headers、trailers、httpVersion、connection6个属性，setEncoding、pause、resume3个方法。
url属性下有一段说明描述了怎么解析get请求：
Request URL string. This contains only the URL that is present in the actual HTTP request. If the request is:
Then request.url will be:
If you would like to parse the URL into its parts, you can use require('url').parse(request.url). Example:
If you would like to extract the params from the query string, you can use therequire('querystring').parse function, or pass true as the second argument to require('url').parse. Example:
按照说明试一下吧（node> 表示 在命令行里敲代码）
那就结合 hello world 写一个动态的hello world
在浏览器地址栏中敲入 http://127.0.0.1:1337/hello name=myname
