我也遇到了同样的问题.似乎" chrome打包的应用"不允许添加"content_security_policy"并重新定义manifest.json

I was also running to the same issue. It seems "chrome packaged app" does not allow adding "content_security_policy" and re-defining the policies in manifest.json

尝试添加它并通过扩展管理器重新加载应用程序，您应该看到以下消息:

Try adding it and re-loading the app via extension manager and you should see the following message:

尝试安装此扩展程序时出现警告: "content_security_policy"仅适用于扩展名和旧版 打包的应用程序，这是一个打包的应用程序.

There were warnings when trying to install this extension: 'content_security_policy' is only allowed for extensions and legacy packaged apps, and this is a packaged app.