AsyncOperation 指示 UnityWebRequest 的进度/完成状态的 AsyncOperation。生成此对象以等待 UnityWebRequest 完成。
开始与远程服务器通信。
调用此方法后,UnityWebRequest 将执行 DNS 解析(如有必要),将一个 HTTP 请求传输到位于目标 URL 的远程服务器,并处理该服务器的响应。
只能在任意给定的 UnityWebRequest 对象上调用一次此方法。调用此方法后,您将无法更改 UnityWebRequest 的任何属性。
此方法将返回一个 AsyncOperation 对象。在协程内部生成 AsyncOperation 将导致协程暂停,直到 UnityWebRequest 遇到系统错误或结束通信为止。
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