According to caniuse, TLS1.3 is supported by 75% of browsers in use: https://can... | Hacker News

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		dfc on June 29, 2019 \| parent \| context \| favorite \| on: Mozilla Server Side TLS – Recommended Configuratio... According to caniuse, TLS1.3 is supported by 75% of browsers in use: https://caniuse.com/#feat=tls1-3

unilynx on June 29, 2019 [–]

And that's just browsers... if you provide an API you may be dealing with external users who are a lot further behind than the browsers.

If your API clients are diverse, turning off pre-TLS1.2 versions even now will probably break a lot of them.

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