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Log the client IP Cloudflare forwards, not the edge address #19

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Merged
samth merged 1 commit into from
Sep 23, 2026
Merged

Log the client IP Cloudflare forwards, not the edge address #19

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11 changes: 10 additions & 1 deletion render.rkt
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Original file line number Diff line number Diff line change
Expand Up @@ -1372,14 +1372,23 @@ in.}
=> header-value]
[else
#"Unknown"]))
;; Requests proxied through Cloudflare arrive from an edge address, so
;; `request-client-ip` reports the edge instead of the original client.
(define client-ip
(cond
[(headers-assq* #"CF-Connecting-IP"
(request-headers/raw req))
=> (lambda (h) (bytes->string/utf-8 (header-value h) #\?))]
[else
(request-client-ip req)]))
(cond
[(regexp-match #"Googlebot" user-agent)
(response/xexpr "Please, do not index.")]
[else
(printf "~a - ~a ~a\n"
(url->string (request-uri req))
user-agent
(request-client-ip req))
client-ip)
(parameterize ([drdr-start-request (current-inexact-milliseconds)])
(top-dispatch req))]))

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