WebView去加载一个H5的时候，加载一个Video的标签遇到的错误
Refused to load the image 'android-webview-video-poster:default_video_poster/4241030533028907709' because it violates the following Content Security Policy directive: "default-src 'self'". Note that 'img-src' was not explicitly set, so 'default-src' is used as a fallback.
这个一个关于Content Security Policy的问题，感觉这个问题很复杂
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