3.19 - Preconnect to external domains - Filter to change the method part

[piotrbak]

User Story

As a user, I want to apply prefetch to eligible domains instead of using preconnect using a filter

Acceptance Criteria

• Filter should be guarded
• By enabling this filter we’ll change preconnect to dns-prefetch
  • <link rel="dns-prefetch" href="https://fonts.googleapis.com/" />

[wordpressfan]

That's already handled here:

wp-rocket/inc/Engine/Media/PreconnectExternalDomains/Frontend/Controller.php

Lines 179 to 188 in af70f6b

	if ( $this->use_prefetch( $domain ) ) {
	// Use dns-prefetch.
	return $this->dns_prefetch_link(
	[
	'href' => esc_url( $domain ),
	1 => 'crossorigin',
	2 => 'data-rocket-prefetch',
	]
	);
	}

and the filter is here:

wp-rocket/inc/Engine/Media/PreconnectExternalDomains/Frontend/Controller.php

Line 207 in af70f6b

return wpm_apply_filters_typed( 'boolean', 'rocket_preconnect_external_domains_use_prefetch', false, $domain );