feat(): add CF-Connection-IP

middleware/realip.go

@@ -9,12 +9,13 @@ import (
 	"strings"
 )
 
+var cfConnectionIP = http.CanonicalHeaderKey("CF-Connecting-IP")
 var trueClientIP = http.CanonicalHeaderKey("True-Client-IP")
 var xForwardedFor = http.CanonicalHeaderKey("X-Forwarded-For")
 var xRealIP = http.CanonicalHeaderKey("X-Real-IP")
 
 // RealIP is a middleware that sets a http.Request's RemoteAddr to the results
-// of parsing either the True-Client-IP, X-Real-IP or the X-Forwarded-For headers
+// of parsing either the CF-Connecting-IP, True-Client-IP, X-Real-IP or the X-Forwarded-For headers
 // (in that order).
 //
 // This middleware should be inserted fairly early in the middleware stack to
@@ -42,7 +43,9 @@ func RealIP(h http.Handler) http.Handler {
 func realIP(r *http.Request) string {
 	var ip string
 
-	if tcip := r.Header.Get(trueClientIP); tcip != "" {
+	if cfcip := r.Header.Get(cfConnectionIP); cfcip != "" {
+		ip = cfcip
+	} else if tcip := r.Header.Get(trueClientIP); tcip != "" {
 		ip = tcip
 	} else if xrip := r.Header.Get(xRealIP); xrip != "" {
 		ip = xrip