HTTP reader (error) ir golang

reader.go

package main

import (
 "io"
  "http"
  "fmt"
)

func main() {
 r, _, err := http.Get("http://www.websvarki.lv/")
 var b []byte
 if err == nil {
  io.ReadFull(r.Body, b)
  r.Body.Close()
 }

 if err != nil {
    fmt.Println(err.String())
 } else {

    for key, value := range r.Header {
        fmt.Println(key);
        fmt.Println(value);
    }
    fmt.Println(b);
  }
}