What are CSP and CORS, and how do they work together?

Can you explain what CSP and CORS are?

CSP stands for Content Security Policy, and CORS stands for Cross-Origin Resource Sharing. CSP is a security feature that helps prevent various attacks like Cross-Site Scripting (XSS) by controlling which resources can be loaded on a web page. CORS, on the other hand, is a mechanism that allows restricted resources on a web page to be requested from another domain outside the domain from which the first resource was served.

How do CSP and CORS work together?

CSP and CORS complement each other in web security. CSP helps define which sources of content are trusted, while CORS allows web applications to make requests to different domains securely. Together, they help mitigate risks associated with loading resources from untrusted sources.

What are some common use cases for CSP?

Common use cases for CSP include preventing XSS attacks, controlling the loading of scripts and styles, and ensuring that only trusted domains can execute code on your site.

Can you give an example of a CSP policy?

Sure! A simple CSP policy might look like this: Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted.com; This policy allows resources to be loaded only from the same origin and from 'trusted.com' for scripts.