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chore: sync camel-4x-upgrade-guide-4_18.adoc with camel-4.18.x branch #25075

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davsclaus merged 1 commit into from
Jul 24, 2026
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chore: sync camel-4x-upgrade-guide-4_18.adoc with camel-4.18.x branch #25075

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9 changes: 9 additions & 0 deletions docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_18.adoc
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Expand Up @@ -40,6 +40,15 @@ The new behavior activates automatically when all of the following are true:
No configuration changes are required. The existing `maxAutoLockRenewDuration` option controls how long
Camel will continue renewing a message's lock.

=== camel-http - gzip double decompression with HttpClient 5.6+

When using HttpClient 5.6+ (including transitively via a Spring Boot BOM on Camel 4.18.x), HttpClient
auto-decompresses gzip response bodies but may leave stale `Content-Encoding`, `Content-Length`, and
`Content-MD5` headers. Camel now reads content encoding from `entity.getContentEncoding()` instead of
the response header and strips stale compression headers after the HTTP call. This prevents a second
decompression attempt that could fail with `ZipException: Not in GZIP format` against gzip-compressing
servers with default settings.

=== camel-mail - MimeMultipartDataFormat inbound header filtering

When unmarshalling a MIME message with `headersInline=true`, the `mime-multipart` data format now applies a
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