typedef struct {
  vm_https_set_channel_response_callback set_channel_callback;
  vm_https_unset_channel_response_callback unset_channel_callback;
  vm_https_release_all_request_response_callback release_all_request_callback;
  vm_https_termination_callback termination_callback;
  vm_https_send_response_callback send_callback;
  vm_https_read_content_response_callback read_content_callback;
  vm_https_cancel_response_callback cancel_callback;
  vm_https_status_query_response_callback status_query_callback;
} vm_https_callbacks_t;