Algo está dando errado em nosso fluxo do Onebox, acho que tem a ver com redirecionamento/FinalDestination. Se eu usar curl assim:
curl -L https://youtube.com/shorts/Cs3sTnLO6EE
Consigo encontrar o title e outras tags meta na resposta:
curl -L https://youtube.com/shorts/Cs3sTnLO6EE | htmlq 'head > meta'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 947221 0 947221 0 0 406174 0 --:--:-- 0:00:02 --:--:-- 504109
<meta content="IE=edge" http-equiv="X-UA-Compatible">
<meta content="ApvK67ociHgr2egd6c2ZjrfPuRs8BHcvSggogIOPQNH7GJ3cVlyJ1NOq/COCdj0+zxskqHt9HgLLETc8qqD+vwsAAABteyJvcmlnaW4iOiJodHRwczovL3lvdXR1YmUuY29tOjQ0MyIsImZlYXR1cmUiOiJQcml2YWN5U2FuZGJveEFkc0FQSXMiLCJleHBpcnkiOjE2OTUxNjc5OTksImlzU3ViZG9tYWluIjp0cnVlfQ==" http-equiv="origin-trial">
<meta content="rgba(255, 255, 255, 0.98)" name="theme-color">
<meta content="A Screencast Of LinkedIn Persona Verification Failure" name="title">
<meta content="For https://www.linkedin.com/help/linkedin/cases/73171318#:~:text=Thanks%20for%20contacting%20us%20about,to%20troubleshoot%20any%20additional%20causes." name="description">
...
curl -L https://youtube.com/shorts/Cs3sTnLO6EE | htmlq 'head > title'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 992110 0 992110 0 0 445530 0 --:--:-- 0:00:02 --:--:-- 739941
<title>A Screencast Of LinkedIn Persona Verification Failure - YouTube</title>
No entanto, quando recebo a resposta através do nosso código do oneboxer, estas são as únicas tags (exceto as de script + style) que recebo no <head>:
uri = FinalDestination.new("https://youtube.com/shorts/Cs3sTnLO6EE", Oneboxer.get_final_destination_options("https://youtube.com/shorts/Cs3sTnLO6EE")).resolve
doc2 = Onebox::Helpers.fetch_response(uri)
Nokogiri.HTML(doc2).css("head").children.each do |headel|
next if headel.name == "script" || headel.name == "style"
puts headel.to_s
end; nil;
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta http-equiv="origin-trial" content="ApvK67ociHgr2egd6c2ZjrfPuRs8BHcvSggogIOPQNH7GJ3cVlyJ1NOq/COCdj0+zxskqHt9HgLLETc8qqD+vwsAAABteyJvcmlnaW4iOiJodHRwczovL3lvdXR1YmUuY29tOjQ0MyIsImZlYXR1cmUiOiJQcml2YWN5U2FuZGJveEFkc0FQSXMiLCJleHBpcnkiOjE2OTUxNjc5OTksImlzU3ViZG9tYWluIjp0cnVlfQ==">
<link rel="shortcut icon" href="https://www.youtube.com/s/desktop/ace6261e/img/favicon.ico" type="image/x-icon">
<link rel="icon" href="https://www.youtube.com/s/desktop/ace6261e/img/favicon_32x32.png" sizes="32x32">
<link rel="icon" href="https://www.youtube.com/s/desktop/ace6261e/img/favicon_48x48.png" sizes="48x48">
<link rel="icon" href="https://www.youtube.com/s/desktop/ace6261e/img/favicon_96x96.png" sizes="96x96">
<link rel="icon" href="https://www.youtube.com/s/desktop/ace6261e/img/favicon_144x144.png" sizes="144x144">
<link rel="stylesheet" href="//fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=YouTube+Sans:wght@300..900&display=swap" nonce="kFtYVVw9wWKkoPdOJkO9xQ">
<link rel="stylesheet" href="/s/player/65578ad1/www-player.css" nonce="kFtYVVw9wWKkoPdOJkO9xQ">
<link rel="stylesheet" href="https://www.youtube.com/s/desktop/ace6261e/cssbin/www-main-desktop-player-skeleton.css" nonce="kFtYVVw9wWKkoPdOJkO9xQ">
<link rel="stylesheet" href="https://www.youtube.com/s/desktop/ace6261e/cssbin/www-onepick.css" nonce="kFtYVVw9wWKkoPdOJkO9xQ">
<link rel="stylesheet" href="https://www.youtube.com/s/_/ytmainappweb/_/ss/k=ytmainappweb.kevlar_base.dsnGl9m3_bM.L.X.O/am=AAAgAAgk/d=0/rs=AGKMywEVyAGSU99VwQpoLFio5FrCvZ1WpA" nonce="kFtYVVw9wWKkoPdOJkO9xQ">
<meta name="theme-color" content="rgba(255, 255, 255, 0.98)">
<link rel="search" type="application/opensearchdescription+xml" href="https://www.youtube.com/opensearch?locale=en_US" title="YouTube">
<link rel="manifest" href="/manifest.webmanifest" crossorigin="use-credentials">
<link rel="canonical" href="undefined">
<link rel="alternate" media="handheld" href="https://m.youtube.com/shorts/Cs3sTnLO6EE">
<link rel="alternate" media="only screen and (max-width: 640px)" href="https://m.youtube.com/shorts/Cs3sTnLO6EE">
<title> - YouTube</title>
<meta name="title" content="">
<meta name="description" content="Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.">
<meta name="keywords" content="video, sharing, camera phone, video phone, free, upload">
<link rel="alternate" href="android-app://com.google.android.youtube/http/www.youtube.com/shorts/Cs3sTnLO6EE">
<link rel="alternate" href="ios-app://544007664/vnd.youtube/www.youtube.com/shorts/Cs3sTnLO6EE">
Pensei que talvez este ignore_redirects estivesse causando isso, mas se eu modificar as opções do FD não fez diferença:
Suspeito que o YouTube provavelmente está reduzindo a raspagem porque eles estão tendo o mesmo problema de raspagem de IA que todo mundo, mas não tenho certeza do que especificamente está fazendo com que obtenhamos a resposta em branco (que parece que obtém as tags meta/title preenchidas via JS da mesma forma que se você visitar no navegador).
Este código aqui para o oneboxing do YouTube é o que espera que as tags de título + imagem sejam preenchidas:
Continuarei investigando 