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「鸿蒙网络编程系列 26」中的「HTTPS 证书自选 CA 校验示例」：技术型文章，专业语气，40-60 字长度。

I. 前言

HTTPS 是为了保证网络数据的安全性和隐私性而被广泛使用的安全协议。在 HTTPS 通信中，服务端和客户端都需要具有有效的证书，并且这些证书必须被信任的证书颁发机构（CA）所签发。在某些场景下，我们可能需要自定义 CA，并且要求客户端在与服务端通信时，自行选择要使用的 CA。在本文中，我们将介绍如何在鸿蒙操作系统中实现 HTTPS 证书自选 CA 校验的示例。

II. 环境准备

在开始之前，我们需要确保我们的开发环境已经满足以下要求：

1. 已经安装并配置了鸿蒙开发环境。
2. 已经创建并编译了一个简单的 HTTPS 服务端和客户端应用程序。
3. 已经在服务端和客户端应用程序中配置了自定义 CA 的证书和密钥文件。

III. 自选 CA 校验示例

1. 在 HTTPS 客户端应用程序中，我们需要创建一个新的 SSLContext 对象，并且为其设置自定义 CA 的信任管理器。

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