[backport camel-4.18.x] CAMEL-23891: camel-mail - filter Camel internal headers in MimeMultipartDataFormat unmarshal#24409
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…artDataFormat unmarshal (apache#24406) Signed-off-by: Andrea Cosentino <ancosen@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Backport of #24406
Cherry-pick of #24406 onto
camel-4.18.x(targeting the 4.18.4 release).Original PR: #24406 — CAMEL-23891: camel-mail - filter Camel internal headers in MimeMultipartDataFormat unmarshal
Original author: @oscerd
Target branch:
camel-4.18.xWhat changed
MimeMultipartDataFormatunmarshalling (headersInline=true) now aligns with the camel-mail consumer: internal Camel headers (Camel*, matched case-insensitively) present in the external MIME headers are no longer copied verbatim onto the Camel message. Ordinary application headers (e.g.X-...) continue to pass through unchanged.copyNonStandardHeaders()delegates toDefaultHeaderFilterStrategy.applyFilterToExternalHeaders(...)on the inbound path, consistent with theMailHeaderFilterStrategyalready applied by the consumer.Backport notes
camel-4.18.x(theHeaderFilterStrategySPI and thedirect:unmarshalonlyinlineheaderstest route already exist on the branch).main(thecamel-4x-upgrade-guide-4_22.adocnote lives onmain; the 4.18-line note is handled as a separate doc-sync onmain).JIRA: https://issues.apache.org/jira/browse/CAMEL-23891
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