Filters the user agent value sent with an HTTP request.
$user_agentstring
$urlstring
'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $url ),
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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/http_headers_useragent