post method
Implementation
Future post(String path, Object body) async {
var url = Uri.https(BASE_URL, path);
var response = await http.post(url,
headers: {
HttpHeaders.contentTypeHeader: "application/json",
HttpHeaders.authorizationHeader: 'Bearer $authorizationToken'
},
body: jsonEncode(body));
return jsonDecode(response.body);
}