whois https://saveavocado.blob.core.windows.net/how-to-save-half-an-avocado/index.html

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Try for webbased whois (don't expect it to work yet)
https://saveavocado.blob.core.windows.net/how-to-save-half-an-avocado/index.html
checking....https://saveavocado.blob.core.windows.net/how-to-save-half-an-avocado/index.html
   $ whois https://saveavocado.blob.core.windows.net/how-to-save-half-an-avocado/index.html
No whois server is known for this kind of object.