Sending POST requests in Dart/Flutter

main.dart

import 'package:http/http.dart' as http;

// Sending a POST request
const url = 'https://some-api.com/users';
const payload = {online: false};
const response = await http.post(url, body: payload);
print(response.statusCode); // 200

// Sending a POST request with headers
const headers = {'Content-Type': 'application/json'};
const response_1 = await http.post(url, headers: headers, body: payload);
print(response_1.statusCode); // 200