SWIS Exclude Domain(s) from Prefetch/Preconnect

swis-prehint-exclusions.php

<?php
/*
Plugin Name: SWIS Pre-Hint Exclusions
Version: 1.0.0
*/

// This example uses the same function for both hooks.
add_filter( 'swis_skip_preconnect', 'my_swis_prehint_exclusions', 10, 2 );
add_filter( 'swis_skip_prefetch', 'my_swis_prehint_exclusions', 10, 2 );
function my_swis_prehint_exclusions( $skip, $domain ) {
	if ( 'my.example.com' === $domain ) {
    return true;
	}
	return $skip;
}

// Or you can use a separate function for preconnect and prefetch to exclude different domains for the two directives.
add_filter( 'swis_skip_preconnect', 'my_swis_preconnect_exclusions', 10, 2 );
function my_swis_preconnect_exclusions( $skip, $domain ) {
	if ( 'no-preconnect.example.com' === $domain ) {
    return true;
	}
	return $skip;
}

add_filter( 'swis_skip_preconnect', 'my_swis_prefetch_exclusions', 10, 2 );
function my_swis_prefetch_exclusions( $skip, $domain ) {
	if ( 'no-prefetch.example.com' === $domain ) {
    return true;
	}
	return $skip;
}