What are the best practices for implementing a Content Security Policy?

What are the best practices for implementing a Content Security Policy?

The best practices for implementing a Content Security Policy (CSP) include defining a strict policy, using nonce or hash for inline scripts, and regularly reviewing and updating your policy.

Can you explain what a nonce is and how to use it?

A nonce is a random value that you generate for each request. You include it in your CSP header and in your script tags, allowing only scripts with the matching nonce to execute.

What should I do if my CSP is blocking legitimate content?

If your CSP is blocking legitimate content, you can adjust your policy by adding the necessary sources to your CSP directives or using the report-uri directive to monitor violations.

How often should I review my CSP?

It's recommended to review your CSP regularly, especially after significant changes to your website or application, to ensure it remains effective and secure.