oembed_fetch_url
Filter Hook: Filters the oEmbed URL to be fetched.
Source: wp-includes/class-wp-oembed.php:546
WP_oEmbed
Class: Core class used to implement oEmbed functionality.
Source: wp-includes/class-wp-oembed.php:20
WP_oEmbed::_fetch_with_format()
Method: Fetches result from an oEmbed provider for a specific format and complete provider URL
Source: wp-includes/class-wp-oembed.php:567