Phalcon Micro app doesn't route correctly with query strings

I'm trying to develop a RESTful API with a Micro app in Phalcon. Now I'm working in the social login with the Facebook SDK for PHP, but I find that when Facebook redirects me to my callback (with a query string inside obviously) the router doesn't find any handler method.

GET: http://localhost:8000/api/v1/register/facebook/callback?code=...&state=...#_=_

Not-Found handler is not callable or is not defined
#0 /home/adrian/PhpstormProjects/myproject/index.php(39): Phalcon\Mvc\Micro->handle()
#1 {main}

All my other routes work properly, but this is the first time I face query strings so I don't know if I'm doing something wrong.

I'm using Micro Collections for routing and the PHP built-in server.

This is my .htrouter.php. When I suppress the query string from $_SERVER['REQUEST_URI'] the route works correctly, but the Facebook SDK fails because it's expecting the parameters. I've tried to find if Phalcon saves the URL and the query string in different $_GET variables, but I think it's not the case.

<?php
if (!file_exists(__DIR__ . '/' . $_SERVER['REQUEST_URI'])) {
    $_GET['_url'] = $_SERVER['REQUEST_URI'];
}
return false;

My micro-collection.php

<?php

use \Phalcon\Mvc\Micro\Collection as MicroCollection;

$register = new MicroCollection();
$register->setHandler('App\Controllers\V1\RegisterController', true);
$register->setPrefix('/api/v1/register');
$register->get('/facebook', 'getAuthFacebook');
$register->get('/facebook/callback', 'facebookCallback');

return $register;

This is my RegisterController.php

<?php

namespace App\Controllers\V1;

use App\Controllers\ControllerBase;
use Phalcon\Http\Response;

class RegisterController extends ControllerBase
{
    public function getAuthFacebook()
    {
        $helper = $this->facebook->getRedirectLoginHelper();
        $permissions = ['email', 'user_likes'];
        $loginUrl = $helper->getLoginUrl('http://localhost:8000/api/v1/register/facebook/callback', $permissions);

        return new Response($loginUrl);
    }

    public function facebookCallback()
    {
        ....
    }
}

My index.php is exactly the same as the one that phalcon-devtools generates for a new project except that I mount my micro collections, so I think that the problem is not there.

Thank you in advance!

Finally, after a lot of research by the forums I've found the solution. I had to add this to my index.php:

Just after:

$app = new \Phalcon\Mvc\Micro($di);

This:

$app->getRouter()->setUriSource(\Phalcon\Mvc\Router::URI_SOURCE_SERVER_REQUEST_URI);

Source

I don't know why it works, because as the documentation says, it changes the router behaviour in order to use $_SERVER['REQUEST_URI'] instead of $_GET['_url'] but that's actually what .htrouter.php does (or at least try to do).

Anyways, as I'm not very experienced with Phalcon, it's very likely that I've misunderstood something. Hope it helps.