Comment by zaneb for HI, I am getting below error while trying to create instance using heat template: "heatclient.exc.HTTPBadRequest: ERROR: <errorresponse><error><message>The request signature does not conform to AWS standards</message>IncompleteSignature<type>Sender</type></error></errorresponse>" Python Code: heat = htclient.Client('1', endpoint = OS_HEAT_ENDPOINT,token =token) template_file = 'heat.yaml' template = open(template_file, 'r') stack = heat.stacks.create(stack_name='stack_new', template= template.read(), parameters={}) heat.yaml heat_template_version: 2013-05-23 description: Simple template to deploy a single compute instance resources: my_instance-new: type: OS::Nova::Server properties: image: c10cc9d9-424f-47b5-b00c-fec94958bf75 flavor: m1.tiny key_name: test_key networks: - network: ext