def check_channel_env_request(self, channel, name, value):
return False<EOL>
Check whether a given environment variable can be specified for the
given channel.  This method should return ``True`` if the server
is willing to set the specified environment variable.  Note that
some environment variables (e.g., PATH) can be exceedingly
dangerous, so blindly allowing the client to set the environment
is almost certainly not a good idea.

The default implementation always returns ``False``.

:param channel: the `.Channel` the env request arrived on
:param str name: name
:param str value: Channel value
:returns: A boolean