HTTP headers used by Cloudflare when operating as a Reverse Proxy

CF-IPCountry – This header contains the country code of the home visitor, it is a two-character value that will contain the country code, if the country is unknown, it will be “XX”
True-Client-IP – Provides the IP address of the client (visitor) for each request to the source, CloudFlare adds the True-Client-IP header. Cloudflare always sends the real visitor’s IP using the CF-Connecting-IP and X-Forwarded-For headers. The third header, True-Client-IP, is added for compatibility with another provider. * Only for the business plan *
X-Forwarded-For – Header X-Forwarded-For is a well-known HTTP header used by proxies, including CloudFlare, to pass along other IP addresses in the request
CF-Connecting-IP – Provides the client (visitor) IP address for each request to the source, CloudFlare adds the CF-Connecting-IP header.
CF-RAY – The CF-Ray header is transmitted with any request and includes an attached hash that identifies the data center through which the request passed.
CF-REQUEEST-ID – Replace the CF-RAY header which is deprecated and no longer guaranteed to be unique. Cf-Request-Id is the new preferred header.
CF-Visitor – It’s used to show the scheme used to connect. If you have Flexible SSL, you will see HTTPS was requested by the visitor, otherwise will be HTTP.
CF-CACHE-STATUS: May contain DYNAMIC, MISS or HIT values. The page was served from Cloudflare’s cache if this header is HIT.

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