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

In Go, you can set headers in an HTTP request with an HTTP client using the http.Header type. Here's an example of how to set headers in an HTTP request:
Set headers in an HTTP request

Example

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))
}

In this example, we create an HTTP client using the http.Client type. We then create an HTTP request using the http.NewRequest function and set custom headers using the req.Header.Add method.

We set two headers in this example: an "Authorization" header with a bearer token, and a "Content-Type" header with a value of "application/json".

We then send the HTTP request using the client.Do method and read the response body using the io.ReadAll function. Finally, we print the response body to the console.

This is just a simple example, but the http.Header type provides many more methods for working with headers, such as getting, deleting, and iterating over header values.

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