Hey folks, I'm attempting to insert some <link rel="dns-prefetch"> elements into the HEAD of all pages served by our Magento site. Unfortunately, the code below doesn't work - and weirdly enough, it only seems to break the final stage of checkout. We're running a pretty AJAX-heavy skin, I believe this one: http://themeforest.net/item/sahara-responsive-magento-themes/7844329?s_phrase=&s_rank=370
Anyway, after hacking and slashing through various documentation I believe this is the least-incorrect way to add what I want to the <HEAD> section of all pages. As mentioned, it seems to break checkout at the final order step, but not much else.
I've replaced the actual name of the customer with 'Customer' throughout these snippets:
app/code/local/Customer/DnsPrefetch/Model/Observer.php:
<? php
class Customer_DnsPrefetch_Model_Observer {
public function alternateLinks() {
$prefetch_urls = array(
"//www.google-analytics.com",
"//cdn.optimizely.com",
"//connect.facebook.net",
"//www.facebook.com");
$headBlock = Mage::app()->getLayout()->getBlock('head');
foreach($prefetch_urls as $url) {
$headBlock->addLinkRel('dns-prefetch', $url);
}
return $this;
}
}
app/code/local/Customer/DnsPrefetch/etc/config.xml:
<?xml version="1.0"?>
<config>
<modules>
<Customer_DnsPrefetch>
<version>1.0.0</version>
</Customer_DnsPrefetch>
</modules>
<frontend>
<events>
<controller_action_layout_generate_blocks_after>
<observers>
<customer_dnsprefetch>
<type>singleton</type>
<class>Customer_DnsPrefetch_Model_Observer</class>
<method>alternateLinks</method>
</customer_dnsprefetch>
</observers>
</controller_action_layout_generate_blocks_after>
</events>
</frontend>
</config>app/etc/modules/Customer_DnsPrefetch.xml:
<?xml version="1.0"?>
<config>
<modules>
<Customer_DnsPrefetch>
<active>true</active>
<codePool>local</codePool>
</Customer_DnsPrefetch>
</modules>
</config>
