[Golang] Get HTTP Response Header

Example of printing HTTP response header via Go standard net/http package. We will HTTP Get this site and print the header of HTTP response.

package main

import (
      "fmt"
      "net/http"
)

func main() {
      resp, err := http.Get("https://siongui.github.io/")
      if err != nil {
              panic(err)
      }
      defer resp.Body.Close()

      for k, v := range resp.Header {
              fmt.Print(k)
              fmt.Print(" : ")
              fmt.Println(v)
      }
}

The header is stored in the Header type in http.Response type.

Result:

Age : [0]
X-Served-By : [cache-itm18826-ITM]
X-Cache-Hits : [0]
Vary : [Accept-Encoding]
Last-Modified : [Mon, 05 Mar 2018 14:43:07 GMT]
X-Github-Request-Id : [65D8:1D40:D8AC39:E9D3C0:5A9EAA7A]
Accept-Ranges : [bytes]
X-Cache : [MISS]
X-Fastly-Request-Id : [72ee00a8726c6a65793ae7fcd0ee317af97269a6]
Server : [GitHub.com]
Expires : [Tue, 06 Mar 2018 14:59:30 GMT]
Access-Control-Allow-Origin : [*]
Via : [1.1 varnish]
X-Timer : [S1520348411.289800,VS0,VE130]
Date : [Tue, 06 Mar 2018 15:00:11 GMT]
Content-Type : [text/html; charset=utf-8]
Cache-Control : [max-age=600]

Tested on: Ubuntu Linux 17.10, Go 1.10.

References:

[1]	Package http - The Go Programming Language

[2]	Pitfall of Golang header operation : golang