4.x: WebServer double compression (re-encoding)

[barchetta]

Environment Details

• Helidon Version: 4.0.8
• Helidon SE

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Problem Description

A customer has reported that WebServer will compress outgoing responses even if the handler sets Content-Encoding: gzip on the response. Apparently in Helidon 3 if the Content-Encoding header was set then the content would not be re-encoded.

The documentation does not describe how explicitly setting Content-Encoding by the handler impacts content negotiation.

Also, it appears as though the enable-compression configuration option was removed in 4.x. The only place I found this was in tests/functional/mp-compression. I'm guessing that's leftover cruft.

The upgrade guide does not mention what happened to enable-compression. Maybe it should.

Steps to reproduce

Reproducer:

ContentEncodingTest.java.txt