'Set the metadata header X-Account-Meta-Temp-URL-Key on your Cloud
Files account.
:param key: X-Account-Meta-Temp-URL-Key
:type key: ``str``
:rtype: ``bool``'

def ex_set_account_metadata_temp_url_key(self, key):

    headers = {'X-Account-Meta-Temp-URL-Key': key}
    response = self.connection.request('', method='POST', headers=headers, cdn_request=False)
    return (response.status in [httplib.OK, httplib.NO_CONTENT, httplib.CREATED, httplib.ACCEPTED])
