How to Construct a URL-Encoded POST Request in Go using `http.NewRequest(...)`?

URL-Encoded POST Request with http.NewRequest(...)

When creating a POST request with a URL-encoded body, the payload should be provided on the body parameter of the http.NewRequest(...) method, rather than appended to the URL as shown in the original code.

package main

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

func main() {
    apiUrl := "https://api.com"
    resource := "/user/"
    data := url.Values{}
    data.Set("name", "foo")
    data.Add("surname", "bar")

    u, _ := url.ParseRequestURI(apiUrl)
    u.Path = resource
    urlStr := u.String() // "https://api.com/user/"

    client := &http.Client{}
    r, _ := http.NewRequest(http.MethodPost, urlStr, strings.NewReader(data.Encode())) // URL-encoded payload
    r.Header.Add("Authorization", "auth_token=\"XXXXXXX\"")
    r.Header.Add("Content-Type", "application/x-www-form-urlencoded")

    resp, _ := client.Do(r)
    fmt.Println(resp.Status)
}

By passing the URL-encoded data as the body of the request, the API can correctly interpret the payload and respond accordingly.

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