implement http

package main

import (
   "fmt"
   "log"
   "net/http"
)

// Engine is the uni handler for all requests
type Engine struct{}

func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
   switch req.URL.Path {
   case "/":
      fmt.Fprintf(w, "URL.Path = %q\n", req.URL.Path)
   case "/hello":
      for k, v := range req.Header {
         fmt.Fprintf(w, "Header[%q] = %q\n", k, v)
      }
   default:
      fmt.Fprintf(w, "404 NOT FOUND: %s\n", req.URL)
   }
}

func main() {
   engine := new(Engine)
   log.Fatal(http.ListenAndServe(":9999", engine))
}