How does "view source" in response headers go missing for certain sites

In developer tools in Chrome, sometimes the "view source" in response headers missing for certain sites? Any ideas why? Take yahoo.com site for example.

This site is just fine.

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But yahoo is like this:

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That's because yahoo.com upgraded to using HTTP/2.

HTTP/2 is a binary protocol. How to display it? As HEX? Or just download the response? It won't make much sense to show the raw binary as text. Probably that's why Chrome removed the 'view source' option for HTTP/2 responses.