I fallow to this REST API codeIgniter 3 guide:
https://github.com/moemoe89/simple-codeigniter-rest-api
This steps done:
You can test the API by including header Content-Type, Client-Service & Auth-Key with value application/json,frontend-client & simplerestapi in every request
Now:
[POST] /auth/login json { "username" : "admin", "password" : "Admin123$"}
everytime I get:
Severity: Notice
Message: Undefined index: HTTP_REFERER
Filename: html/error_general.php
Line Number: 4
Due to large code, you can fallow to this three files to review code:
Controller/book.php
https://github.com/moemoe89/simple-codeigniter-rest-api/blob/master/application/controllers/Book.php
Controller/Auth.php
https://github.com/moemoe89/simple-codeigniter-rest-api/blob/master/application/controllers/Auth.php
Models/MyModel.php
https://github.com/moemoe89/simple-codeigniter-rest-api/blob/master/application/models/MyModel.php