In this case, the browser would strip away anything after the domain name in the URL sent in the Referer header. For example, if you want the target web sites to be able to tell that the user is coming from your search results page without revealing the full URL, you can use “origin”. “origin” will make the browser only include the referring origin and not the full URL in the Referer header.This is the default policy if an explicit policy has not been specified. In this case, if a search result links to a secure context, the browser would send the Referer header but if the target web site is an insecure HTTP site, the browser will refuse the send the Referer header in clear text. For instance, with the search engine example above, if your privacy concern is limited to people monitoring the HTTP traffic instead of the target website, you can use the “no-referrer-when-downgrade” policy. “no-referrer-when-downgrade” is similar to “no-referrer” with the exception that the Referer header is only omitted when navigating from a secure context to a non-secure one.The “no-referrer” referrer policy could be used for that purpose. For example, some search engines add information about the user’s search phrase among other things to the URL, and they may not want to leak the user’s search phrase to the search result web sites that the user clicks on. This can be useful when you want to hide the Referer header for privacy reasons. “no-referrer” prevents sending any Referer header.There are a few different policy states, each with a specific goal in mind. The referrer policy is a new W3C specification which we have been implementing in Firefox that allows the page to provide the browser with a policy that lets the page have more control over how the Referer header is set. This is useful for example for gathering analytics data about where your web site users are coming from. The HTTP Referer header is a (misspelled!) header that allows a target page to know what source page the user is coming from (for example, by clicking a link on that page). Using fetch(), you can now control the HTTP request referrer and referrer policy. We have recently implemented a few new additions to the Fetch API, and in this post I will give an overview of them and include examples of how they can help you develop your web applications. If you’re not familiar with the Fetch API, it would be a nice idea to read about it before proceeding. The WHATWG Fetch API provides a modern way to fetch network resources and gives you fine grained control over the details of the request and response. Around a year ago, we wrote about the new fetch() API.
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