Задача golang

package main
 
import (
    "encoding/json"
    "io/ioutil"
    "log"
    "net/http"
    "os"
    "regexp"
)
 
var args = os.Args[1:]
 
func handler(w http.ResponseWriter, r *http.Request) {
    // if our request is a GET request
    if r.Method == "GET" {
        // set header to indicate a json response
        w.Header().Set("Content-Type", "application/json")
 
        // write the response
        err := json.NewEncoder(w).Encode(args)
        if err != nil {
            // write 500 error if Encode fails
            w.WriteHeader(http.StatusInternalServerError)
        }
    }
 
    // if our request is a POST or PUT request
    if r.Method == "PUT" || r.Method == "POST" {
        // read body
        reqBody, err := ioutil.ReadAll(r.Body)
        if err != nil {
            // write 500 error if Encode fails
            w.WriteHeader(http.StatusInternalServerError)
        }
 
        // split the body string into substrings with 
        // one or more whitespace as a delimiter
        pattern := regexp.MustCompile(`\s+`)
        newArgs := pattern.Split(string(reqBody), -1)
 
        // append new arguments to the existing ones
        args = append(args, newArgs...)
        // return 204
        w.WriteHeader(http.StatusNoContent)
    }
}
 
func main() {
    // handler for out gets, posts, puts
    http.HandleFunc("/", handler)
    // listen, server and fatally die when needed
    log.Fatal(http.ListenAndServe(":8099", nil))
}