Feature Improvement: Allow relative URLs in Extra > Preload specific requests

[rdhutchins]

You can inject URLs to preload under "Preload specific requests (advanced users)", but this only works for full URLs, not relative URLs.

The output <link rel="preload"...> tag should work with relative URLs, but in the plugin code it looks like we are validating specifically full urls:

// classes/autoptimizeExtra.php
            if ( filter_var( $preload, FILTER_VALIDATE_URL ) !== $preload ) {
                continue;
            }

Would it be as simple as changing the validation to allow relative URLs? Is there a reason full URLs are required?

[futtta]

If I remember correctly, filter_var with FILTER_VALIDATE_URL was chosen because of security reasons mainly. I consider the inconvenience of requiring/ inserting full URL rather small :-)

[rdhutchins]

Fair enough! The reason it came up for me is that I have a staging version of my site (at a staging.* subdomain) so I would have preferred to give just the path. With the full url either I have to change it or the preload part doesn't work on staging.

…

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