On our cPanel boxes, missing assets were serving the entire Magento page.
cPanel's defaults to ErrorDocument 404 /404.shtml but /404.shtml doesn't exist in Magento's document root, so the .htaccess gets executed again and redirects /404.shtml to index.php (using mod_rewrite).
Magento's default .htaccess should specify 404, 500, and other error handlers explicitly.
To fix this beahviour, we added the following to our .htaccess:
ErrorDocument 404 /errors/404.php
We probably should also add 500s as well:
ErrorDocument 500 /errors/500.php
If the wrong session is used, it is because the session_name is wrong. The session name is set in Mage_Core_Model_Session_Abstract_Varien::setSessionName().
But after a look on the Stacktrace, I have no idea, why overwriting _construct or even __construct should be a problem here:
#0 Mage_Core_Model_Session_Abstract_Varien->setSessionName(frontend) called at [app/code/core/Mage/Core/Model/Session/Abstract/Varien.php:111]
#1 Mage_Core_Model_Session_Abstract_Varien->start(frontend) called at [app/code/core/Mage/Core/Model/Session/Abstract/Varien.php:166]
#2 Mage_Core_Model_Session_Abstract_Varien->init(core, frontend) called at [app/code/core/Mage/Core/Model/Session/Abstract.php:84]
#3 Mage_Core_Model_Session_Abstract->init(core, frontend) called at [app/code/core/Mage/Core/Model/Session.php:42]
#4 Mage_Core_Model_Session->__construct(Array ([name] => frontend)) called at [app/code/core/Mage/Core/Model/Config.php:1348]
#5 Mage_Core_Model_Config->getModelInstance(core/session, Array ([name] => frontend)) called at [app/Mage.php:462]
#6 Mage::getModel(core/session, Array ([name] => frontend)) called at [app/Mage.php:476]
#7 Mage::getSingleton(core/session, Array ([name] => frontend)) called at [app/code/core/Mage/Core/Controller/Varien/Action.php:494]
#8 Mage_Core_Controller_Varien_Action->preDispatch() called at [app/code/core/Mage/Core/Controller/Front/Action.php:64]
#9 Mage_Core_Controller_Front_Action->preDispatch() called at [app/code/core/Mage/Core/Controller/Varien/Action.php:408]
#10 Mage_Core_Controller_Varien_Action->dispatch(view) called at [app/code/core/Mage/Core/Controller/Varien/Router/Standard.php:250]
#11 Mage_Core_Controller_Varien_Router_Standard->match(Mage_Core_Controller_Request_Http Object ([] => /test.html,[] => ,[] => /test.html,[] => ,[] => ,[] => Array (),[] => catalog,[] => ,[] => Mage_Catalog,[] => ,[] => Array (),[] => Array ([0] => _GET,[1] => _POST),[] => /catalog/product/view/id/21,[] => ,[] => ,[] => catalog/product/view/id/21,[] => Array ([id] => 21),[] => ,[] => Array ([rewrite_request_path] => test.html),[] => 1,[] => catalog,[] => module,[] => product,[] => controller,[] => view,[] => action)) called at [app/code/core/Mage/Core/Controller/Varien/Front.php:176]
#12 Mage_Core_Controller_Varien_Front->dispatch() called at [app/code/core/Mage/Core/Model/App.php:354]
#13 Mage_Core_Model_App->run(Array ([scope_code] => ,[scope_type] => store,[options] => Array ())) called at [app/Mage.php:683]
#14 Mage::run(, store) called at [index.php:87]
Best Answer
Add following config into global di.xml [SR/StackExchange/etc/di.xml]
<virtualType name="SR\StackExchange\Model\Session\Storage" type="Magento\Framework\Session\Storage"> <arguments> <argument name="namespace" xsi:type="string">stackexchange</argument> </arguments> </virtualType> <type name="SR\StackExchange\Model\Session"> <arguments> <argument name="storage" xsi:type="object">SR\StackExchange\Model\Session\Storage</argument> </arguments> </type>SR/StackExchange/Model/Session.php
namespace SR\StackExchange\Model; class Session extends \Magento\Framework\Session\SessionManager { }