Params
array(2) {
  ["login"]=>
  string(9) "superuser"
  ["password"]=>
  string(13) "superpassword"
}

Request
string(48) "{"login":"superuser","password":"superpassword"}"

Response
string(60) "{"error":{"code":1,"description":"wrong login or password"}}"

Result
array(1) {
  ["error"]=>
  array(2) {
    ["code"]=>
    int(1)
    ["description"]=>
    string(23) "wrong login or password"
  }
}