指示 UnityWebRequest 系统是否应采用 HTTP/1.1 分块传输编码方法。
此属性指示 UnityWebRequest 是否应采用 HTTP/1.1 分块传输编码方法，该方法允许系统发送部分数据，并且由服务器提示系统利用 100/Continue HTTP 响应获取更多数据。调用 Send 后，此属性将无法更改。
一般情况下，此属性通常应设置为 true，因为它可以在向服务器发送大量数据时节省宽带，但旧服务器可能还不支持。此设置对不向服务器传输数据的请求没有影响，如 GET 请求。
**注意：**在 WebGL 构建目标中，此设置被忽略。而 Web 浏览器将处理协议协商。
默认值：false。
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