For some reason the plugin is generating a path that is missing the / at the start of the path for the concatenated files... and so the path I get is: http://testwp.localhost_minify/....... instead of http://testwp.localhost/_minify/.....

You can hack the plugin and add a slash on line 36: const DEFAULT_ENDPOINT = '_minify'; but that's never a good idea.

I tried for now to at least use a filter to change this option but it seems to have no effect...

function my_minify_option( $options ){
$options = array_merge( $options, array( 'endpoint' => '/_testing/' ) );
return $options;
}
add_filter( 'dependency_minification_options', 'my_minify_option' );

It's a bummer because otherwise this looks to be a great simple clean way to minify and concatenate.

Any one else having this slash issue? Am I missing something obvious with my filter? I duplicated a filter example right from the plugin author so I thought it should work.

Thanks!