Golang Read HTTP Header

The example below uses gorilla/mux package

package main

import (
  "fmt"
  "log"
  "net/http"
  "github.com/gorilla/mux"
)

func YourHandler(w http.ResponseWriter, r *http.Request) {
  for i,v := range r.Header {
    fmt.Println(i, v)
  }
  fmt.Fprintf(w, r.Header.Get("User-Agent"))
}

func main() {
  r := mux.NewRouter()
  r.HandleFunc("/", YourHandler)
  log.Fatal(http.ListenAndServe(":8000", r))
}

With the codes above, try browsing it with this URL with your browser

http://localhost:8000

Your web server console will print all the HTTP headers, similar like the screenshot below.

Web browser will show the user agent.

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