Sample Go program that does an HTTP post of a JSON payload, includes setting request headers, doing the request, getting the response and printing it out.

SampleGoHttpPost.go

func main() {
    var jsonBuffer = []byte(`{"my_key":"My Value."}`)

    req, _ := http.NewRequest("POST", "http://api.mycompany.com", bytes.NewBuffer(jsonBuffer))
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := ioutil.ReadAll(resp.Body)

    fmt.Println("HTTP Response Status:", resp.Status)
    fmt.Println("HTTP response Headers:", resp.Header)
    fmt.Println("HTTP response Body:", string(body))
}