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Alexandre authored
Based on OpenSSL manual and pyOpenSSL documentation, a closed connection raises an error SSL_ERROR_ZERO_RETURN which raises a ZeroReturnError exception. See <https://www.openssl.org/docs/man1.1.0/man3/SSL_get_error.html> and <https://www.pyopenssl.org/en/stable/api/ssl.html#OpenSSL.SSL.ZeroReturnError>
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