[issue43582] SSLContext.sni_callback docs inaccurately describe available handshake info

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

I don't see any way to fix the issue with our current API. OpenSSL 1.1.1 provides a new API SSL_client_hello_get0_ext() to access raw extension during early stage of ClientHello phase. https://www.openssl.org/docs/man1.1.1/man3/SSL_client_hello_get1_extensions_present.html

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