HTTP Referer Report

This page simply displays the HTTP referer as sent in the HTTP request headers (by the browser / user-agent), as well as your IP address and a bunch of other HTTP request headers.

$_SERVER['HTTP_REFERER'] (PHP)
<Not Set>

document.referrer (JavaScript)
"<Requires JavaScript>"

(Note that the JavaScript referrer property has two r's)

HTTP Request Headers

As returned from PHP's apache_request_headers() function:

Array
(
    [Accept] => */*
    [User-Agent] => Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
    [Host] => w3dk.com
)

IP Address

For completeness, your reported IP address is:

$_SERVER['REMOTE_ADDR'] (PHP) = 3.133.109.30

Reverse lookup on IP address: ec2-3-133-109-30.us-east-2.compute.amazonaws.com

Short links to this page

This is to test whether URL shortening services pass the referer.

http://bit.ly/checkreferer - Passes the referer header
http://tinyurl.com/checkreferer - Passes the referer header
http://goo.gl/7AJgP - Passes the referer header

Alternative Links / Blank Referers

http://blankreferrer.com/u/w3dk.com/permalink/referer.php - Removes the referer header

Redirects to this page

In order to test the HTTP Referer when following a redirect, the following links all redirect back to this page in various ways:

HTTP Temporary (302) redirect back to this page - Original HTTP Referer (ie. this page) is maintained and the intermediary redirect page is not listed in the browser history.
JavaScript redirect (replace() method) back to this page - Original Referer is lost and set to intermediary (redirect) page. Note that this method uses the window.location.replace() method, so the intermediary/redirect page is replaced in the browser history.
JavaScript redirect (href property) back to this page - Original Referer is lost and set to intermediary (redirect) page. This method assigns directly to the window.location.href property, so the intermediary/redirect page is NOT replaced in the browser history.
META Refresh back to this page - Original Referer is lost and set to intermediary (redirect) page.

Other sites that report the HTTP Referer

See immediately what HTTP referer is passed when navigating from this non-SSL page. Note that navigating from HTTPS to HTTP the browser blocks the referer for security reasons. Navigating from HTTP to HTTPS there is no such security and the HTTP referer should be passed by the browser.

http://WhatsMyInfo.com/
http://www.WhatsMyReferer.com/ - This seems to be "broken" as it always reports a blank referer?!
https://www.WhatIsMyReferer.com/ (HTTPS)
https://referer.rustybrick.com/ (HTTPS)

HTTP Referer sent from Google SERPs

When clicking on a result in the Google SERPs (HTTPS) and navigating to here (an HTTP page), the HTTP Referer is still set to "https://www.google.co.uk" in most modern browsers (except IE). It is not blank as you might expect. This is probably due to the <meta content="origin" name="referrer"> element in the head section of the search results page.

In IE11, the HTTP Referer is set to:
http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwj-o47L883LAhWMF5oKHQ3LA_wQFggjMAA&url=http%3A%2F%2Fw3dk.com%2Fpermalink%2Freferer.php&usg=AFQjCNF4mBtIhIZvnz7vjeQRWdts4WfndA