View the headers of a request

server.go

// Works with Golang 1.7
// Run `go run server.go` and then visit the url shown
package main

import (
    "fmt"
    "net/http"
)
const PORT = "8080"

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Look in the terminal")
    fmt.Println("\n\n#### New request ####")
    for k, v := range r.Header {
        fmt.Println(k, ": ", v)
    }
}

func main() {
    http.HandleFunc("/", handler)
    fmt.Println("To view the  to http://localhost:" + PORT )
    http.ListenAndServe(":"+PORT, nil)
}