Referrer Policy is a crucial security and privacy feature that controls how much referrer information is sent when users navigate from your website to other sites. When someone clicks a link, browsers typically send the referrer header containing the URL of the page where the link originated.

This policy helps you manage what information gets shared with external websites. Without proper configuration, you might unintentionally leak sensitive data through URLs, such as:

• Session IDs in URL parameters
• User-specific paths or directory structures
• Search queries containing private information

Common Referrer Policy values include:

• no-referrer: No referrer information is sent
• same-origin: Referrer is sent only to same-site origins
• strict-origin: Sends origin only, not full URL (recommended for most sites)
• no-referrer-when-downgrade: Default - sends full URL for same security level requests

To implement Referrer Policy, add the Referrer-Policy header to your server configuration or use the meta tag in your HTML: <meta name="referrer" content="strict-origin">.

Proper Referrer Policy configuration enhances user privacy, protects sensitive data, and helps maintain your website's security posture while allowing legitimate cross-site functionality when needed.