CreateOrUpdateProxy.
        [Preview API]
        :param :class:`<Proxy> <azure.devops.v5_0.core.models.Proxy>` proxy:
        :rtype: :class:`<Proxy> <azure.devops.v5_0.core.models.Proxy>`

def create_or_update_proxy(self, proxy):
        """CreateOrUpdateProxy.
        [Preview API]
        :param :class:`<Proxy> <azure.devops.v5_0.core.models.Proxy>` proxy:
        :rtype: :class:`<Proxy> <azure.devops.v5_0.core.models.Proxy>`
        """
        content = self._serialize.body(proxy, 'Proxy')
        response = self._send(http_method='PUT',
                              location_id='ec1f4311-f2b4-4c15-b2b8-8990b80d2908',
                              version='5.0-preview.2',
                              content=content)
        return self._deserialize('Proxy', response)