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我已将无状态 Web 应用程序部署到 Azure 应用服务，并在应用程序设置中禁用了 ARR Affinity。是否可以禁用此功能，但针对特定请求启用它？

我在 2016 年遇到了benjaminperkins 的一篇文章，该帖子表明可以通过添加“Arr-Disable-Session-Affinity”标头来为单个请求禁用此功能，但我想要反过来，“Arr-Enable-Session-亲和力”。

我希望能够向单个实例发出请求，以在远程操作后预热内存中的缓存。我了解如何在启用 ARRAffinity 时构建对 App Server Web 应用程序实例的 URL 请求，但这对我不起作用，因为我不想全局启用它。

这是我想做的一个例子： 

ServiceClientCredentials serviceCreds = 
   await ApplicationTokenProvider.LoginSilentAsync(this.config.ADTenant, this.config.ADApplicationId, this.config.ADKey);

ResourceManagementClient resourceClient = new ResourceManagementClient(serviceCreds);
resourceClient.SubscriptionId = this.config.SubscriptionId;
WebSiteManagementClient webClient = new WebSiteManagementClient(serviceCreds);
webClient.SubscriptionId = this.config.SubscriptionId;

string urlPath = "custompath/";
SiteInner site = 
   webClient.WebApps.List().Where(a => a.Id == "webapp id").FirstOrDefault();
IList<SiteInstanceInner> instances = 
   webClient.WebApps.ListInstanceIdentifiers(site.ResourceGroup, site.Name).ToList();

SiteInstanceInner instance = instances.FirstOrDefault();

// these are initialized as a singleton, inline here as an example
HttpClientHandler handler = new HttpClientHandler() { UseCookies = false };
HttpClient httpClient = new HttpClient(handler, disposeHandler: false);

httpClient.Timeout = new TimeSpan(0, 0, 30);
webClient = await GetWebsiteClientIfNull(webClient);

Uri url = new Uri($"http://{site.DefaultHostName}/{urlPath}");

HttpRequestMessage message = new HttpRequestMessage(HttpMethod.Get, url);
message.Headers.Add("Arr-Enable-Session-Affinity", bool.TrueString);
message.Headers.Add("Cookie", $"ARRAffinity={WebUtility.UrlEncode(instance.Name)};");

HttpResponseMessage response = await webClient.HttpClient.SendAsync(message);

在应用服务上禁用 ARRAffinity 时，有没有办法做到这一点？

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