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。
在任何给定的 UnityWebRequest 对象上，此方法只能调用一次。
调用此方法后，您无法更改任何 UnityWebRequest 的属性。在调用 SendWebRequest 之后，便无法更改 UnityWebRequest 属性。
此方法将返回 WebRequestAsyncOperation 对象。在协程内部生成 WebRequestAsyncOperation 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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