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Content Security Policies

Webpack is capable of adding nonce to all scripts that it loads. To activate the feature set a __webpack_nonce__ variable needs to be included in your entry script. A unique hash based nonce should be generated and provided for each unique page view this is why __webpack_nonce__ is specified in the entry file and not in the configuration. Please note that nonce should always be a base64-encoded string.

Examples

In the entry file:

// ...
__webpack_nonce__ = 'c29tZSBjb29sIHN0cmluZyB3aWxsIHBvcCB1cCAxMjM=';
// ...

Enabling CSP

Please note that CSPs are not enabled by default. A corresponding header Content-Security-Policy or meta tag <meta http-equiv="Content-Security-Policy" ...> needs to be sent with the document to instruct the browser to enable the CSP. Here's an example of what a CSP header including a CDN white-listed URL might look like:

Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted.cdn.com;

For more information on CSP and nonce attribute, please refer to Further Reading section at the bottom of this page.