docs: add a note about -proxy-preserve-host flag

Add a note about the flag to `preserveHost` filter docs. Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>
zalando · Dec 12, 2024 · 7774c2b · 7774c2b
1 parent f5afdba
commit 7774c2b
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diff --git a/docs/reference/filters.md b/docs/reference/filters.md
@@ -115,6 +115,8 @@ Example:
 route1: * -> preserveHost("true") -> "http://backend.example.org";
 ```
 
+Default `proxyPreserveHost` behavior can be configured by `-proxy-preserve-host` flag which is `false` by default.
+
 ### modRequestHeader
 
 Replace all matched regex expressions in the given header.