HTTP 415 Unsupported Media Type

<?php

$url = "https://demo.traccar.org/api/session";

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

$headers = array(
   "Accept: application/json",
   "Authorization: Basic bGVkemNvcEBnbWFpbC5jb206cmF0aXJhdGkx",
   "Content-Type: application/json",
   "Content-Length: 0",
);
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
//for debug only!
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);

$resp = curl_exec($curl);
curl_close($curl);
var_dump($resp);

?>

can anyone help me with api login?

Wrong content type, as the error message pretty clearly indicates. This endpoint doesn't accept JSON. You should carefully read the API documentation.

Hello Anton yes i finally fixed it, but i have samesite cookie issue. will it work in iframe without ssl? with http in http

this is working example, if someone need.

<?php
    $auth = base64_encode("email:password");
    $url = "http://***.***.***.***:8082/api/session";
    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

    $headers = array(
       "Accept: application/json",
       "Authorization: Basic $auth",
       "Content-Type: application/x-www-form-urlencoded;charset=UTF-8",
    );
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
    $data = "email=email&password=password";
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    $res = curl_exec($curl);
    curl_close($curl);
    return $res;
?>