controlador-descarga/config/web.php

<?php

$params = require __DIR__ . '/params.php';
$db = require __DIR__ . '/db.php';
$dbr = require __DIR__ . '/dbr.php';

$config = [
  'id' => 'basic',
  'basePath' => dirname(__DIR__),
  'bootstrap' => ['log'],
  'aliases' => [
    '@bower' => '@vendor/bower-asset',
    '@npm'   => '@vendor/npm-asset',
  ],
  'components' => [
    'request' => [
      'cookieValidationKey' => 'H-D9NgQ8byEDjH6lIcBmeZMYcKGVprZE',
      'parsers' => [
        'application/json' => 'yii\web\JsonParser',
      ]
    ],
    'cache' => [
      'class' => 'yii\caching\FileCache',
    ],
    'user' => [
      'identityClass' => 'app\models\Usuario',
      'enableAutoLogin' => true,
      'loginUrl' => 'login'
    ],
    'errorHandler' => [
      'errorAction' => 'site/error',
    ],
    'mailer' => [
      'class' => 'yii\swiftmailer\Mailer',
      // send all mails to a file by default. You have to set
      // 'useFileTransport' to false and configure a transport
      // for the mailer to send real emails.
      'useFileTransport' => true,
    ],
    'log' => [
      'traceLevel' => YII_DEBUG ? 3 : 0,
      'targets' => [
        [
          'class' => 'yii\log\FileTarget',
          'levels' => ['error', 'warning'],
        ],
      ],
    ],
    'db' => $db,
    'dbr' => $dbr,
    'urlManager' => [
      'enablePrettyUrl' => true,
      'showScriptName' => false,
      'rules' => [
      ],
    ],
  ],
  'params' => $params,
];

if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = [
      'class' => 'yii\debug\Module',
      // uncomment the following to add your IP if you are not connecting from localhost.
      //'allowedIPs' => ['127.0.0.1', '::1'],
    ];

    $config['bootstrap'][] = 'gii';
    $config['modules']['gii'] = [
      'class' => 'yii\gii\Module',
      // uncomment the following to add your IP if you are not connecting from localhost.
      //'allowedIPs' => ['127.0.0.1', '::1'],
    ];
}

return $config;