TNetHttpClient APNS

根据提供的引用[1]，TNetHttpClient是Delphi中的一个HTTP客户端组件，而APNS是Apple Push Notification Service的缩写，是苹果公司提供的推送服务。因此，TNetHttpClient APNS是使用Delphi中的TNetHttpClient组件来与APNS进行通信。

使用TNetHttpClient APNS的步骤如下：
1.创建TNetHttpClient对象，并设置请求的URL和请求方法为POST。
2.设置请求头部信息，包括Content-Type、Authorization和apns-topic等信息。
3.设置请求体信息，包括设备的token、推送的payload等信息。
4.发送请求并获取响应结果。

以下是一个使用TNetHttpClient APNS发送推送通知的示例代码：

uses
  System.Net.HttpClient, System.Net.HttpClientComponent;

procedure SendAPNSNotification;
var
  HttpClient: TNetHttpClient;
  Request: TNetHTTPRequest;
  Response: IHTTPResponse;
  APNSUrl: string;
  APNSPayload: string;
  APNSToken: string;
  APNSAuth: string;
  APNSTopic: string;
begin
  HttpClient := TNetHttpClient.Create(nil);
  Request := TNetHTTPRequest.Create(nil);
  try
    APNSUrl := 'https://api.push.apple.com/3/device/';
    APNSPayload := '{"aps":{"alert":"Hello World!"}}';
    APNSToken := 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
    APNSAuth := 'Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
    APNSTopic := 'com.example.app';

    Request.MethodString := 'POST';
    Request.URL := APNSUrl + APNSToken;
    Request.ContentType := 'application/json';
    Request.CustomHeaders['Authorization'] := APNSAuth;
    Request.CustomHeaders['apns-topic'] := APNSTopic;
    Request.Source := TStringStream.Create(APNSPayload, TEncoding.UTF8);

    Response := HttpClient.Execute(Request);
    if Response.StatusCode = 200 then
      ShowMessage('Push notification sent successfully.')
    else
      ShowMessage('Failed to send push notification.');  finally
    Request.Free;
    HttpClient.Free;
  end;
end;