Dictionary<string,string>
包含着在最新 HTTP 响应中收到的所有响应标头的字典。如果未收到响应，则返回 null。
检索包含着此 UnityWebRequest 在最新 HTTP 响应中收到的所有响应标头的字典。
如果 UnityWebRequest 收到多个响应（例如在重定向期间），则仅包含最新/最终响应中的标头。
**注意：**此方法在每次调用时会分配一个新的字典对象。如果您要多次检索返回值，您可能需要缓存此调用的返回值。
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