text: # coding=utf-8
  # --------------------------------------------------------------------------
  # Copyright (c) Microsoft Corporation. All rights reserved.
  # Licensed under the MIT License. See License.txt in the project root for license information.
  # Code generated by Microsoft (R) AutoRest Code Generator.
  # Changes may cause incorrect behavior and will be lost if the code is regenerated.
  # --------------------------------------------------------------------------
  from typing import Any, Callable, Dict, Generic, Optional, TypeVar
  import warnings
  
  from azure.core.exceptions import HttpResponseError, ResourceExistsError, ResourceNotFoundError, map_error
  from azure.core.pipeline import PipelineResponse
  from azure.core.pipeline.transport import AsyncHttpResponse, HttpRequest
  from azure.mgmt.core.exceptions import ARMErrorFormat
  
  from ... import models
  
  T = TypeVar('T')
  ClsType = Optional[Callable[[PipelineResponse[HttpRequest, AsyncHttpResponse], T, Dict[str, Any]], Any]]
  
  class NetworkManagementClientOperationsMixin:
  
      async def check_dns_name_availability(
          self,
          location: str,
          domain_name_label: str,
          **kwargs
      ) -> "models.DnsNameAvailabilityResult":
          """Checks whether a domain name in the cloudapp.azure.com zone is available for use.
  
          :param location: The location of the domain name.
          :type location: str
          :param domain_name_label: The domain name to be verified. It must conform to the following
           regular expression: ^[a-z][a-z0-9-]{1,61}[a-z0-9]$.
          :type domain_name_label: str
          :keyword callable cls: A custom type or function that will be passed the direct response
          :return: DnsNameAvailabilityResult, or the result of cls(response)
          :rtype: ~azure.mgmt.network.v2017_10_01.models.DnsNameAvailabilityResult
          :raises: ~azure.core.exceptions.HttpResponseError
          """
          cls = kwargs.pop('cls', None)  # type: ClsType["models.DnsNameAvailabilityResult"]
          error_map = {404: ResourceNotFoundError, 409: ResourceExistsError}
          error_map.update(kwargs.pop('error_map', {}))
          api_version = "2017-10-01"
  
          # Construct URL
          url = self.check_dns_name_availability.metadata['url']  # type: ignore
          path_format_arguments = {
              'location': self._serialize.url("location", location, 'str'),
              'subscriptionId': self._serialize.url("self._config.subscription_id", self._config.subscription_id, 'str'),
          }
          url = self._client.format_url(url, **path_format_arguments)
  
          # Construct parameters
          query_parameters = {}  # type: Dict[str, Any]
          query_parameters['domainNameLabel'] = self._serialize.query("domain_name_label", domain_name_label, 'str')
          query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
  
          # Construct headers
          header_parameters = {}  # type: Dict[str, Any]
          header_parameters['Accept'] = 'application/json'
  
          # Construct and send request
          request = self._client.get(url, query_parameters, header_parameters)
          pipeline_response = await self._client._pipeline.run(request, stream=False, **kwargs)
          response = pipeline_response.http_response
  
          if response.status_code not in [200]:
              map_error(status_code=response.status_code, response=response, error_map=error_map)
              raise HttpResponseError(response=response, error_format=ARMErrorFormat)
  
          deserialized = self._deserialize('DnsNameAvailabilityResult', pipeline_response)
  
          if cls:
              return cls(pipeline_response, deserialized, {})
  
          return deserialized
      check_dns_name_availability.metadata = {'url': '/subscriptions/{subscriptionId}/providers/Microsoft.Network/locations/{location}/CheckDnsNameAvailability'}  # type: ignore
  