def update(self, webhook_method=values.unset, webhook_filters=values.unset,<EOL>pre_webhook_url=values.unset, post_webhook_url=values.unset,<EOL>pre_webhook_retry_count=values.unset,<EOL>post_webhook_retry_count=values.unset, target=values.unset):
return self._proxy.update(<EOL>webhook_method=webhook_method,<EOL>webhook_filters=webhook_filters,<EOL>pre_webhook_url=pre_webhook_url,<EOL>post_webhook_url=post_webhook_url,<EOL>pre_webhook_retry_count=pre_webhook_retry_count,<EOL>post_webhook_retry_count=post_webhook_retry_count,<EOL>target=target,<EOL>)<EOL>
Update the WebhookInstance

:param unicode webhook_method: The HTTP method to be used when sending a webhook request.
:param unicode webhook_filters: The list of webhook event triggers that are enabled for this Service.
:param unicode pre_webhook_url: The absolute url the pre-event webhook request should be sent to.
:param unicode post_webhook_url: The absolute url the post-event webhook request should be sent to.
:param unicode pre_webhook_retry_count: The number of retries in case of pre-event webhook request failures.
:param unicode post_webhook_retry_count: The number of retries in case of post-event webhook request failures.
:param WebhookInstance.Target target: The routing target of the webhook.

:returns: Updated WebhookInstance
:rtype: twilio.rest.messaging.v1.webhook.WebhookInstance