Angular http.get不起作用，但是http.post起作用

Question

GET调用不起作用，这是控制台中的错误消息：

core.js:6014 ERROR Error: Uncaught (in promise): HttpErrorResponse:
{"headers":
  {"normalizedNames"{}, "lazyUpdate":null}, 
  "status":200, 
  "statusText":"OK",
  "url":"http://localhost:4200/api/php/services/global/validateSession.php",
  "ok":false,"name":"HttpErrorResponse",
  "message":"Http failure during parsing for 
 http://localhost:4200/api/php/services/global/validateSession.php",
  "error":{
     "error":{},
     "text":"<?php\r\nsession_start();\r\nif(!isset($_SESSION['user'])){\r\n\techo json_encode(array('sesionActiva' => false, 'mensaje' => 'Sesion inactiva.'));\r\n}\r\nelse\r\n{\r\n\techo json_encode(array('sesionActiva' => true, 'mensaje' => 'Sesion activa.'));\r\n}\r\n?>"
  }
}

没有解释get调用，但是我的帖子调用工作正常，我在后端使用xampp和angular与php。