How to send JSON string in POST request in Go (Golang)

Hello everyone! I just started learning Go and I'm trying to figure out how to send JSON data via POST request to an external REST API. I have a struct with user data that I want to send to the server in JSON format. Here's my current code that doesn't work: ```go package main import ( "fmt" "net/http" "strings" ) type User struct { Name string `json:"name"` Email string `json:"email"` Age int `json:"age"` } func main() { user := User{ Name: "Ivan Petrov", Email: "ivan@example.com", Age: 30, } // Trying to send JSON string resp, err := http.Post( "https://api.example.com/users", "application/json", strings.NewReader(user), // This doesn't work! )