Websites often defer to the browser’s default.įor navigations and iframes, the data present in the Referer header can also be accessed via JavaScript using document.referrer. When no policy is set, the browser's default is used. The Referer-Policy header defines what data is made available in the Referer header, and for navigation and iframes in the destination's document.referrer.Įxactly what information is sent in the Referer header in a request from your site is determined by the Referrer-Policy header you set. HTTP requests may include the optional Referer header, which indicates the origin or web page URL the request was made from. Beyond the referrer policy, the way browsers deal with referrers might change-so keep an eye on it.You can also check out this demo to see the change in action. To try out the change in Chrome, enable the flag at chrome://flags/#reduced-referrer-granularity.This is the new default, but websites can still pick a policy of their choice.Chrome plans to gradually enable strict-origin-when-cross-origin as the default policy in 85 this may impact use cases relying on the referrer value from another origin.Browsers are evolving towards privacy-enhancing default referrer policies, to provide a good fallback when a website has no policy set.The Referrer-Policy header and referrer in JavaScript and the DOM are spelled correctly. The Referer header is missing an R, due to an original misspelling in the spec.If you're unsure of the difference between 'site' and 'origin', check out Understanding 'same-site' and 'same-origin'.

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