How to exclude browser specific sources?

Hi,

Thanks for this great plugin!

My question: is it possible to exclude browser specific resources, notably for IE, from being pushed?

For example, the default Twenty Seventeen theme includes a html5.js and a ie8.css for IE8/9 which, when HTTP/2 Server Push is activated, are pushed to ALL browsers. In fact, they are pushed ONLY to browsers that do not need them because IE8 and 9 do not even support HTTP2…

I see a $src filter in the plugin which could be used like this:

function my_http2_exclude_filter( $src ) {
    $exclude = array( 'ie8.css', 'html5.js');
    foreach ( $exclude as $str ) {
        if ( stripos($src, $str) ) $src = "";
    }
    return $src;
}
add_filter('http2_link_preload_src', 'my_http2_exclude_filter');

But I realize filtering based on file name is not a very elegant solution… Anyone know a better way?

• This topic was modified 7 years, 9 months ago by Rolf Allard van Hagen.
• This topic was modified 7 years, 9 months ago by Rolf Allard van Hagen.