Relative favicon URLs not correctly resolved when unfurling a URL

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This issue occurs when an unfurling a URL like https://www.birdwatching.com/optics/2014travelscopes/review.html, which includes the favicon using <link rel="shortcut icon" href="../../images_icons/favicon.ico">

proxy.php tries to load the URL https://www.birdwatching.com/optics/2014travelscopes/review.html/../../images_icons/favicon.ico which resolves incorrectly to https://www.birdwatching.com/optics/images_icons/favicon.ico (it should be...

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