code: def _ExtractProxyConfig(product_yaml_key, proxy_config_data):
    
    cafile = proxy_config_data.get('cafile', None)
    disable_certificate_validation = proxy_config_data.get(
        'disable_certificate_validation', False)
  
    http_proxy = proxy_config_data.get(_HTTP_PROXY_YAML_KEY)
    https_proxy = proxy_config_data.get(_HTTPS_PROXY_YAML_KEY)
    proxy_config = ProxyConfig(
        http_proxy=http_proxy,
        https_proxy=https_proxy,
        cafile=cafile,
        disable_certificate_validation=disable_certificate_validation)
  
    return proxy_config
docs: Returns an initialized ProxyConfig using the given proxy_config_data.
  
    Args:
      product_yaml_key: a string indicating the client being loaded.
      proxy_config_data: a dict containing the contents of proxy_config from the
        YAML file.
  
    Returns:
      If there is a proxy to configure in proxy_config, this will return a
      ProxyConfig instance with those settings. Otherwise, it will return None.
  
    Raises:
      A GoogleAdsValueError if one of the required keys specified by _PROXY_KEYS
      is missing.