diff --git a/Reverse-Proxy-Diagnostics-Troubleshooting.md b/Reverse-Proxy-Diagnostics-Troubleshooting.md
index 19027df..129e8c7 100644
--- a/Reverse-Proxy-Diagnostics-Troubleshooting.md
+++ b/Reverse-Proxy-Diagnostics-Troubleshooting.md
@@ -220,18 +220,14 @@ See also
 
 ```
 		RequestHeader    set X-Forwarded-Port "%{SERVER_PORT}s"
-		RequestHeader    unset X-Forwarded-Proto
-		<If "%{HTTPS} =~ /on/">
-			RequestHeader    set X-Forwarded-Proto "https"
-		</If>
+		RequestHeader    set X-Forwarded-Proto expr=%{REQUEST_SCHEME}
 ```
 
-
-
 ## nginx
 * See also https://github.com/Kozea/Radicale/blob/master/contrib/nginx/radicale.conf
 
 ```
     proxy_set_header  X-Forwarded-Host $host;
     proxy_set_header  X-Forwarded-Port $server_port;
+    proxy_set_header  X-Forwarded-Proto $scheme;
 ```
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