网络服务器
用JavaScript编写的Web服务器。
运行服务器：“ node webserver.js”
要在服务器运行后连接到服务器：“ telnet localhost 9999”
You should see the server log "Listening"
返回运行telnet的终端：“ GET /test.txt HTTP / 1.1”
This returns a 200 ok because the file "test.txt" exists in the server's directory.
"GET /testing.txt HTTP/1.1"
This returns a 404 Not Found because "testing.txt" does not exist in the server's directory.
