curl SSL certificate error

[אופיר קוברמן‎]

Hello i am trying to do curl with header 
	$opts = array(
	  'http'=>array(
    	 'header'=>"X-AUTH-TOKEN: her will be \r\n"
	  	 'method'=>"GET",
	  )
	);
stream_context_set_params($context, array('user_agent' => 'UserAgent/1.0'));
$context = stream_context_create($opts);
$API_URL ="url here";
$contact_api = file_get_contents($API_URL ."?". http_build_query($uri), false, $context);

and when i run it , i get this error :
: failed to open stream: SSL certificate error - certificate invalid or non-existent, [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) in
in the postman or outher server its work i think its somethink in setting  in appengine 

i didnt find any answer from google