Reading and writing HTTP headers

The previous recipe describes how you can create a HTTP request in general. This recipe will go into detail on how to read and write request headers.

How to do it...

1. Open the console and create the folder chapter07/recipe07.
2. Navigate to the directory.
3. Create the headers.go file with the following content:

        package main

        import (
          "fmt"
          "net/http"
        )

        func main() {

          header := http.Header{}

          // Using the header as slice
          header.Set("Auth-X", "abcdef1234")
          header.Add("Auth-X", "defghijkl")
          fmt.Println(header)

          // retrieving slice of values in header
          resSlice := header["Auth-X"]
          fmt.Println(resSlice)

          // get the first value
          resFirst := header.Get("Auth-X")
          fmt.Println(resFirst)

          // replace all existing values with
          // this one
          header.Set("Auth-X", "newvalue")
          fmt.Println...