oscerd opened a new pull request, #24454:
URL: https://github.com/apache/camel/pull/24454
## Follow-up to #24409 — makes the CAMEL-23891 fix actually filter on
`camel-4.18.x`
The 4.18.x backport #24409 (merged) is a **silent no-op**: it instantiated
`new DefaultHeaderFilterStrategy()` and relied on it filtering the `Camel*`
namespace **by default**. That default only exists since **CAMEL-23543**
(`c2ce0267`, "Centralize and harden Camel* header filtering in
DefaultHeaderFilterStrategy"), which is on `main` and `camel-4.21.x` **only** —
it is **not** on `camel-4.18.x`. On this branch `inFilterStartsWith` is `null`
by default, so `applyFilterToExternalHeaders(...)` returns `false` for every
header and `Camel*` headers from inline MIME content were still copied onto the
Camel message.
### Change
Configure the in-filter explicitly on the data format's strategy:
```java
private final HeaderFilterStrategy headerFilterStrategy =
createInboundHeaderFilterStrategy();
private static HeaderFilterStrategy createInboundHeaderFilterStrategy() {
DefaultHeaderFilterStrategy strategy = new DefaultHeaderFilterStrategy();
strategy.setInFilterStartsWith(DefaultHeaderFilterStrategy.CAMEL_FILTER_STARTS_WITH);
// {"Camel","camel"}
return strategy;
}
```
This is the same approach already merged on the `camel-4.14.x` backport
(#24445). Case-insensitive matching (e.g. `CAMELBaz`) works because
`lowerCase=true` and `filterOnMatch=true` are the defaults on this branch.
### Validation
- `MimeMultipartDataFormatTest` — **22 pass** (the
`unmarshalInlineHeadersFiltersCamelInternalHeaders` case failed `expected
<null> but was <blocked>` before this change, passes after).
- Full reactor `mvn clean install -DskipTests` — BUILD SUCCESS.
No upgrade-guide change (guide history is canonical on `main` per project
policy).
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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