How do you set headers in an HTTP request with an HTTP client in Go?

package main

import (
    "fmt"
    "net/http"
    "strings"
)

func main() {
    // Create an HTTP client
    client := &http.Client{}

    // Create an HTTP request with custom headers
    req, err := http.NewRequest("GET", "https://example.com", nil)
    if err != nil {
        fmt.Println("Error creating HTTP request:", err)
        return
    }
    req.Header.Add("Authorization", "Bearer <token>")
    req.Header.Add("Content-Type", "application/json")

    // Send the HTTP request
    resp, err := client.Do(req)
    if err != nil {
        fmt.Println("Error sending HTTP request:", err)
        return
    }

    // Read the response body
    body, err := io.ReadAll(resp.Body)
    if err != nil {
        fmt.Println("Error reading HTTP response body:", err)
        return
    }

    // Print the response body
    fmt.Println(string(body))
}