IONIC2/ANGULAR2 cannot access API created by laravel5.3

The Laravel 5.3 API has been configured to complete

    //category.service.ts    private headers = new Headers({'Content-Type': 'application/json','Accept':'application/json','Authorization':'Bearer '+window.localStorage.getItem('token')});    private heroesUrl = 'http://xingao.5188cms.com/api/user';  // URL to web api    private handleError(error: any): Promise {      console.error('An error occurred', error); // for demo purposes only      return Promise.reject(error.message || error);    }

This way to access, hint XMLHttpRequest cannot load http://xingao.5188cms.com/api/user. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access. , it seems to be a cross-domain problem, but I use postman can be successfully obtained data

Step Two

I replaced the link with ahttp://xingao.5188cms.com/test.php

//test.php
  
   

Or not?XMLHttpRequest cannot load http://xingao.5188cms.com/test.php. Request header field authorization is not allowed by Access-Control-Allow-Headers in preflight response.

Step Three

I changed the link to one /test.json , but I can.

What is the reason for that ....

Reply content:

The Laravel 5.3 API has been configured to complete

    //category.service.ts    private headers = new Headers({'Content-Type': 'application/json','Accept':'application/json','Authorization':'Bearer '+window.localStorage.getItem('token')});    private heroesUrl = 'http://xingao.5188cms.com/api/user';  // URL to web api    private handleError(error: any): Promise {      console.error('An error occurred', error); // for demo purposes only      return Promise.reject(error.message || error);    }

This way to access, hint XMLHttpRequest cannot load http://xingao.5188cms.com/api/user. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access. , it seems to be a cross-domain problem, but I use postman can be successfully obtained data

Step Two

I replaced the link with ahttp://xingao.5188cms.com/test.php

//test.php
  
   

Or not?XMLHttpRequest cannot load http://xingao.5188cms.com/test.php. Request header field authorization is not allowed by Access-Control-Allow-Headers in preflight response.

Step Three

I changed the link to one /test.json , but I can.

What is the reason for that ....

Access-Control-Allow-Origin
Cross-domain issues
This is the browser limit

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