PHP API错误 - 无法打开流：HTTP请求失败！ HTTP / 1.1 401未经授权

I'm trying to query a website using the php query, but getting error:

$ php main.php

PHP Warning:  file_get_contents(https://api.transport.nsw.gov.au/v1/tp/stop_finder?
outputFormat=rapidJSON&type_sf=any&name_sf=Wynyard+Station&
coordOutputFormat=EPSG%3A4326&TfNSWSF=true): failed to open stream: HTTP request failed!
HTTP/1.1 401 Unauthorized
 in /home/cg/root/7504993/main.php on line 14.

Is there anything that I'm missing?

Tried - "Integrated Windows Authentication", under Tools > Security > Local Intranet zone > Sites > Advanced, the target web site is listed.

<?php
 // User's search query
 $apiEndpoint = 'https://api.transport.nsw.gov.au/v1/tp/';
 $apiCall = 'stop_finder';
 // Build the request parameters
 $params = array(
     'outputFormat' => 'rapidJSON',
     'type_sf' => 'any',
     'name_sf' =>'Wynyard Station',
     'coordOutputFormat' => 'EPSG:4326',
     'TfNSWSF' => 'true'
   );
  $url = $apiEndpoint . $apiCall . '?' . http_build_query($params);
  $response = file_get_contents($url);
  $json = json_decode($response, true);