get_video_info YouTube endpoint suddenly returning 404 not found

Question

https://www.youtube.com/get_video_info?video_id={videoId} is throwing

Response status code does not indicate success: 404 (Not Found).

Answer 1

EDIT: I found this can work. I don't why. But it really works.

https://www.youtube.com/get_video_info?video_id=onz2k4zoLjQ&eurl=https%3A%2F%2Fyoutube.googleapis.com%2Fv%2Fonz2k4zoLjQ&html5=1&c=TVHTML5&cver=6.20180913

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You can add &html5=1 in the url to fix it.

Answer 2

For some reason, Google is trying to make it harder.

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Edit Aug 2021:

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I just published a new NuGet for C# developers that brings URLs of get_video_info. Enjoy! https://www.nuget.org/packages/Youtube.VideoInfo

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The initial value was
https://www.youtube.com/get_video_info?video_id={videoId}&eurl=https://youtube.googleapis.com/v/{videoId}

Then the HTML5 tag was added:
https://www.youtube.com/get_video_info?html5=1&video_id={videoId}&eurl=https://youtube.googleapis.com/v/{videoId}

And now (June 2021) the new solution is:
https://www.youtube.com/get_video_info?video_id={videoId}&eurl=https%3A%2F%2Fyoutube.googleapis.com%2Fv%2Fonz2k4zoLjQ&html5=1&c=TVHTML5&cver=6.20180913

We need to keep our eyes open. looks like someone in google doesn't like the fact that YouTube enables this feature.