|  | 
Set the peer verification mode.
asio::error_code set_verify_mode( verify_mode v, asio::error_code & ec);
This function may be used to configure the peer verification mode used by 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_CTX_set_verify.