Make a URL-encoded POST request using http NewRequest

Question

I want to make a POST request to an API sending my data as a application x-www-form-urlencoded content type  Due to the fact that I need to manage the request headers  I m using the http NewRequest method  urlStr string  body io Reader  method to create a request  For this POST request I append my data query to the URL and leave the body empty  something like this   package main  import        bytes       fmt       net http       net url       strconv     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     u RawQuery   data Encode       urlStr    fmt Sprintf   v   u      https   api com user  name foo amp surname bar       client     amp http Client       r       http NewRequest  POST   urlStr  nil      r Header Add  Authorization    auth token   XXXXXXX         r Header Add  Content-Type    application x-www-form-urlencoded       r Header Add  Content-Length   strconv Itoa len data Encode           resp       client Do r      fmt Println resp Status      As I response  I get always a 400 BAD REQUEST  I believe the problem relies on my request and the API does not understand which payload I am posting  I m aware of methods like Request ParseForm  not really sure how to use it in this context though  Maybe am I missing some further Header  maybe is there a better way to send payload as a application json type using the body parameter

User · Accepted Answer

URL-encoded payload must be provided on the body parameter of the http.NewRequest(method, urlStr string, body io.Reader) method, as a type that implements io.Reader interface.

Based on the sample 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.Set("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")
    r.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))

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

resp.Status is 200 OK this way.

[http] Make a URL-encoded POST request using `http.NewRequest(...)`

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