/Html/Refused to display 'https://www.youtube.com/' in a frame because it set 'X-Frame-Options' to 'sameorigin'.

Refused to display 'https://www.youtube.com/' in a frame because it set 'X-Frame-Options' to 'sameorigin'.

You must ensure the URL contains embed rather watch as the 
/embed endpoint allows outside requests, whereas the /watch endpoint 
does not.

<iframe width="420" height="315" src="https://www.youtube.com/embed/A6XUVjK9W4o" frameborder="0" allowfullscreen></iframe>

Source: stackoverflow.com

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