Cannot get request headers on REST server - php

Question

Im using Slim Framework as an API. Im making a GET request to it. But I cannot get the headers. My PHP file looks like:
require 'Slim/Slim.php';
$app = new Slim();
$app->get('/project/:id', add_authorize(), 'getProject');
$app->run();
function getProject($project_title) {
//connect to database and return project details
}
function add_authorize() {
return function (){
$app = Slim::getInstance();
$charset = $app->request->headers->get('ACCEPT_CHARSET');
};
}
I get the response:
( ! ) Fatal error: Cannot access protected property Slim::$request in C:\wamp\www\server\device_api\index.php on line 23
Call Stack
# Time Memory Function Location
1 0.0010 248528 {main}( ) ..\index.php:0
2 0.0240 860056 Slim->run( ) ..\index.php:9
3 0.0240 878816 Slim_Route->dispatch( ) ..\Slim.php:1052
4 0.0240 878864 call_user_func:{C:\wamp\www\server\device_api\Slim\Route.php:387} ( ) ..\Route.php:387
5 0.0240 878944 {closure:C:\wamp\www\server\device_api\index.php:19-25}( ) ..\Route.php:387
I have tried absolutely everything but to no avail. I also tried getting headers directly with:
$device_id = $_SERVER['HTTP_DEVICE_ID'];
but this also failed. Any ideas how I can get a header?

Answer 1

Not sure if it's because of your PHP version / Slim version. This is my composer.json file:
"require": {
"slim/slim": "2.3.*"
}
I'm using PHP 5.5.14 on Mac OSX Yosemite. But anyway, try this:
// closure callback
function getProject($id)
{
// connect to database and return project details
// var_dump($id);
}
// act as a middleware, the first argument is \Slim\Route
function addAuthorize($route)
{
// var_dump($route); // \Slim\Route
$app = Slim::getInstance();
$request = $app->request();
$charset = $request->headers->get('ACCEPT_CHARSET');
}
$app->get('/project/:id', 'addAuthorize', 'getProject');
// Turn on the light
$app->run();

Answer 2

I suggest to do the following and not wrap things in a closure:
require 'Slim/Slim.php';
$app = new Slim();
$app->get('/project/:id', add_authorize(), 'getProject');
$app->run();
function getProject($project_title) {
//connect to database and return project details
}
function add_authorize() use ($app) {
$charset = $app->request->headers->get('ACCEPT_CHARSET');
}

Answer 3

The problem is that you are trying to get HTTP Headers like this
$app->request->headers->get('ACCEPT_CHARSET');
And that works after Slim version 2.x. You probably have a previous version, like 1.x.
The previous way to access the HTTP Headers was like this, without the getter:
$app->request->headers('ACCEPT_CHARSET');
You could simply change that in your code or move onto a new version of Slim.
In example here's the Slim Documentation for version 1.6.7
https://github.com/codeguy/Slim/blob/1.6.7/docs/request-headers.markdown