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Set the peer verification mode.
void set_verify_mode(
    verify_mode v,
    asio::error_code & ec);
This function may be used to configure the peer verification mode used by the stream. The new mode will override the mode inherited from the context.
                  A bitmask of peer verification modes. See ssl::verify_mode
                  for available values.
                
Set to indicate what error occurred, if any.
            Calls SSL_set_verify.