using RestSharp;


var options = new RestClientOptions("http://localhost:56350/api/v1/Agents/List/GetHeadings");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"UdListDefinitionId\": 123,\n  \"ListItemId\": 123,\n  \"ShowDeleted\": true\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({UdListDefinitionId: 123, ListItemId: 123, ShowDeleted: true})
};

fetch('http://localhost:56350/api/v1/Agents/List/GetHeadings', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "56350",
  CURLOPT_URL => "http://localhost:56350/api/v1/Agents/List/GetHeadings",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'UdListDefinitionId' => 123,
    'ListItemId' => 123,
    'ShowDeleted' => true
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

import requests

url = "http://localhost:56350/api/v1/Agents/List/GetHeadings"

payload = {
    "UdListDefinitionId": 123,
    "ListItemId": 123,
    "ShowDeleted": True
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({UdListDefinitionId: 123, ListItemId: 123, ShowDeleted: true})
};

fetch('http://localhost:56350/api/v1/Agents/List/GetHeadings', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

[
  {
    "Id": 123,
    "Name": "<string>",
    "ToolTip": "<string>",
    "Deleted": true,
    "Rank": 123,
    "Type": "<string>",
    "ColorBlock": 123,
    "IconHint": "<string>",
    "Selected": true,
    "LastChanged": "2023-11-07T05:31:56Z",
    "ChildItems": "<array>",
    "ExtraInfo": "<string>",
    "StyleHint": "<string>",
    "Hidden": true,
    "FullName": "<string>",
    "TableRight": {
      "Mask": "<string>",
      "Reason": "<string>"
    },
    "FieldProperties": {}
  }
]