Setting up a content security policy (CSP)
Content Security Policy, web security headers, XSS prevention, and protection from XSS attacks are essential for securing any modern website. In this video, Sabina from Contabo shows you how to implement a Content Security Policy (CSP) to safeguard your site from malicious scripts and cross-site scripting vulnerabilities.
Learn how CSP acts as a browser-level gatekeeper, controlling which scripts, images, and styles can load, while blocking untrusted sources. Whether you’re using Apache or NGINX, you’ll see simple config examples to get started. Not ready to enforce it yet? Try CSP in report-only mode for safe testing and debugging.
This tutorial also covers how CSP helps eliminate mixed content issues on HTTPS sites and pairs well with other web security headers for complete protection.
Want help writing your own policy? Sabina shares tools like cspgenerator.org to simplify the process.
🕐 Timeline:
0:00 - 0:39 Introduction to CSP and XSS prevention
0:39 - 0:53 How Content Security Policy works
0:53 - 1:21 Setting up CSP in Apache and NGINX
1:21 - 1:36 Using report-only mode for testing
1:36 - 2:15 Fixing mixed content and enforcing HTTPS
2:15 - 2:50 Tools & tips to build your CSP easily
2:50 - 3:04 Conclusion
Key Topics Covered:
What is a Content Security Policy (CSP) and how it helps prevent XSS attacks
How to set up CSP on Apache and NGINX web servers
Using CSP in report-only mode for safe testing and debugging
Fixing mixed content issues with HTTPS and enforcing secure resources
Combining CSP with other web security headers for full protection
Using tools like cspgenerator.org and Mozilla Observatory to create CSP rules easily
Important Notes:
CSP acts as a browser-level firewall, blocking untrusted scripts and preventing XSS attacks
Use report-only mode first to test your policy without breaking your site
Always use HTTPS and update insecure links to avoid mixed content issues
Use tools like cspgenerator.org or Mozilla Observatory to build CSP rules quickly and accurately
Pair CSP with other web security headers (like HSTS, X-Content-Type-Options) for stronger protection
Remember to reload your server after updating header configurations in Apache or NGINX
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