Programming language:Whatever

because it violates the following Content Security Policy directive: "default-src 'none'". Note that 'font-src' was not explicitly set, so 'default-src' is used as a fallback

<meta http-equiv="Content-Security-Policy" content="default-src 'self'; font-src 'self' data: fonts.gstatic.com;">

Code: Whatever

devServer: {

        historyApiFallback: true
    }
};

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