post function
Sends an HTTP POST request with the given headers and body to the given URL.
body sets the body of the request. It can be a String, a List<int> or
a Map<String, String>. If it's a String, it's encoded using encoding
and used as the body of the request. The content-type of the request will
default to "text/plain".
If body is a List, it's used as a list of bytes for the body of the
request.
If body is a Map, it's encoded as form fields using encoding. The
content-type of the request will be set to
"application/x-www-form-urlencoded"; this cannot be overridden.
encoding defaults to utf8.
For more fine-grained control over the request, use Request or StreamedRequest instead.
Implementation
Future<Response> post(Uri url,
{Map<String, String>? headers, Object? body, Encoding? encoding}) =>
_withClient((client) =>
client.post(url, headers: headers, body: body, encoding: encoding));