[PR] [backport camel-4.18.x] CAMEL-23891: camel-mail - filter Camel internal headers in MimeMultipartDataFormat unmarshal [camel]

["oscerd (via GitHub)" <gi...@apache.org>]

oscerd opened a new pull request, #24409:
URL: https://github.com/apache/camel/pull/24409

   ## 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.x`
   
   ### What changed
   
   `MimeMultipartDataFormat` unmarshalling (`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 to `DefaultHeaderFilterStrategy.applyFilterToExternalHeaders(...)` on the inbound path, consistent with the `MailHeaderFilterStrategy` already applied by the consumer.
   
   ### Backport notes
   
   - Code + unit test cherry-picked from the merged commit; verified to apply cleanly on `camel-4.18.x` (the `HeaderFilterStrategy` SPI and the `direct:unmarshalonlyinlineheaders` test route already exist on the branch).
   - The upgrade-guide entry is intentionally **not** included here: per project policy the upgrade-guide history is canonical on `main` (the `camel-4x-upgrade-guide-4_22.adoc` note lives on `main`; the 4.18-line note is handled as a separate doc-sync on `main`).
   
   JIRA: https://issues.apache.org/jira/browse/CAMEL-23891
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code) on behalf of Andrea Cosentino
   


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Re: [PR] [backport camel-4.18.x] CAMEL-23891: camel-mail - filter Camel internal headers in MimeMultipartDataFormat unmarshal [camel]

["oscerd (via GitHub)" <gi...@apache.org>]

oscerd merged PR #24409:
URL: https://github.com/apache/camel/pull/24409


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