Lexiconga/src/php/api/Response.php

<?php
class Response {
  private static function defaultHeaders () {
    header('Access-Control-Allow-Origin: *');
    header('Expires: Sun, 01 Nov 2015 22:46:51 GMT');
    header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
    header('Cache-Control: post-check=0, pre-check=0', false);
    header('Pragma: no-cache');
    if (strpos($_SERVER['SERVER_NAME'], 'localhost') !== false) {
      # To resolve the issue with "Your connection to this site is not secure" message
      header('Content-Security-Policy: upgrade-insecure-requests env=HTTPS');
    }
  }
  
  public static function json ($data, $http_code = 200) {
    header('Content-Type: application/json; charset=utf-8');
    Response::defaultHeaders();
    http_response_code($http_code);
    echo json_encode($data);
  }
  
  public static function html ($html, $http_code = 200) {
    header('Content-Type: text/html; charset=utf-8');
    Response::defaultHeaders();
    http_response_code($http_code);
    echo $html;
	}
}