[backport camel-4.18.x] CAMEL-23588: camel-undertow - filter the legacy websocket.* exchange-header prefix#23992
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oscerd merged 1 commit intoJun 12, 2026
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…filter the legacy websocket.* exchange-header prefix Backport to camel-4.18.x of the main-branch change (d5a717d). Adds the legacy websocket.* prefix to the undertow HeaderFilterStrategy in/out filters (in addition to Camel* / camel* / org.apache.camel.*) and documents it in the 4.18 upgrade guide, alongside the CAMEL-23532 vertx-websocket / atmosphere-websocket / iggy family.
davsclaus
approved these changes
Jun 12, 2026
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Backport to
camel-4.18.xof CAMEL-23588 (main commitd5a717dd0f8).What
UndertowHeaderFilterStrategynow also filters the legacywebsocket.*Exchange-header prefix (in addition to theCamel*/camel*/org.apache.camel.*prefixes it already filtered), in both the inbound (wire -> exchange) and outbound (exchange -> wire) directions. This follows the dedicated-filter-strategy shape used by CAMEL-23532 forcamel-vertx-websocket/camel-atmosphere-websocket/camel-iggy, which were already backported to this branch.The
UndertowConstantsstring values are unchanged (they are part of the component's externally-visible API contract), so routes referencing them within an undertow route continue to work unchanged. As documented, theHeaderFilterStrategygoverns only the transport boundary and is defence-in-depth; route authors handling untrusted inbound traffic should still stripwebsocket.*headers explicitly.Changes
UndertowHeaderFilterStrategy: addwebsocket.to the in/out filter prefixes (identical to main).camel-4x-upgrade-guide-4_18.adoc: add thecamel-undertow"potential breaking change" entry, grouped with the existing websocket family.The matching entry will be synced to the
4_18upgrade guide onmainin a separate doc-sync PR, per the upgrade-guide policy.Claude Code on behalf of Andrea Cosentino