How to Send Form Data (application/x-www-form-urlencoded) in Go

Use url.Values to encode your data and set the Content-Type header to application/x-www-form-urlencoded before sending the request.

import (
	"net/http"
	"net/url"
)

values := url.Values{
	"field1": []string{"value1"},
	"field2": []string{"value2"},
}

req, _ := http.NewRequest("POST", "https://example.com/api", strings.NewReader(values.Encode()))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

resp, err := http.DefaultClient.Do(req)

Sending form data as application/x-www-form-urlencoded in Go uses a simple, readable format where keys and values are joined by equals signs and pairs are separated by ampersands. It is the standard way to submit HTML forms and is widely supported by web servers. Think of it like filling out a paper form where each box has a label and your answer.