(camel) branch backport/26183-to-camel-4.22.x created (now 9f3f3645ae35)

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      at 9f3f3645ae35 [backport camel-4.22.x] CAMEL-24424: camel-vertx-http - apply the outbound header filter on the REST producer

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     new 9f3f3645ae35 [backport camel-4.22.x] CAMEL-24424: camel-vertx-http - apply the outbound header filter on the REST producer

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(camel) 01/01: [backport camel-4.22.x] CAMEL-24424: camel-vertx-http - apply the outbound header filter on the REST producer

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gnodet pushed a commit to branch backport/26183-to-camel-4.22.x
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commit 9f3f3645ae3524d3cd5aabb7243944f210ae92ff
Author: Andrea Cosentino <an...@gmail.com>
AuthorDate: Tue Sep 8 13:30:13 2026 +0200

    [backport camel-4.22.x] CAMEL-24424: camel-vertx-http - apply the outbound header filter on the REST producer
---
 .../ROOT/pages/camel-4x-upgrade-guide-4_22.adoc       | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_22.adoc b/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_22.adoc
index ba334d38fbbd..a403ef72355c 100644
--- a/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_22.adoc
+++ b/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_22.adoc
@@ -1865,3 +1865,22 @@ Routes that set `useRecovery=false` are unaffected. Routes that left recovery en
 default, stop seeing in-progress aggregations re-delivered, and start seeing genuine recovery. The cache
 now also holds one entry per completed and not yet confirmed exchange; those entries are removed on
 confirmation.
+
+=== camel-vertx-http - the REST producer applies the outbound header filter
+
+`VertxHttpRestHeaderFilterStrategy.applyFilterToCamelHeaders` delegated to
+`applyFilterToExternalHeaders`, so it consulted the inbound filter while implementing the outbound
+direction. The outbound filter that `VertxHttpHeaderFilterStrategy` installs was therefore never
+applied, and the sibling REST strategies in `camel-http-common`, `camel-netty-http` and
+`camel-undertow` all delegate to the matching method.
+
+A REST producer that resolves to `vertx-http` and does not configure its own `headerFilterStrategy`
+now filters the common HTTP headers on the outbound direction, as the other HTTP components already
+did. A message header named `Content-Length`, `Content-Type`, `Host`, `Cache-Control`, `Connection`,
+`Date`, `Pragma`, `Trailer`, `Transfer-Encoding`, `Upgrade`, `Via` or `Warning` is no longer copied
+onto the outgoing request; the `Content-Type` of the request is still taken from the exchange as
+before. Headers consumed by the URI template or the query parameters continue to be filtered, and a
+custom `headerFilterStrategy` is used as-is and is unaffected.
+
+Routes that relied on one of those headers reaching the wire must set it through the endpoint
+configuration or supply a `headerFilterStrategy` that permits it.