Get response's original content-encoding

[kwin]

Jetty Version
12.1.5

Jetty Environment
Client

Java Version
21

Question
I use a Jetty HTTP Client and want to know if a response was sent with in compressed format. However the original Content-Encoding header seem to be removed by Jetty when using the compression handlers as outlined in https://jetty.org/docs/jetty/12.1/programming-guide/client/http.html#content-response.
Apache HTTPClient no longer removes the original response headers (even when decompressing the response body), compare with https://issues.apache.org/jira/browse/HTTPCLIENT-2409.

How do get this information if not exposed via Response headers in Jetty HTTP Client?

[kwin]

Seems the original response header is removed here:

jetty.project/jetty-core/jetty-client/src/main/java/org/eclipse/jetty/client/transport/HttpReceiver.java

Line 554 in adfc2e1

else if (header == HttpHeader.CONTENT_ENCODING && !seenContentEncoding)

[joakime]

You can turn off the automatic content decoding, and the header will still be seen.
Leaving you to handle the content encoding yourself.

[joakime]

Look at https://jetty.org/docs/jetty/12.1/programming-guide/client/http.html#content-response

There it details how the content decoders works, and a code snippet on how to clear the automatic content decoders.

[kwin]

I don't want to disable the automatic decompression. Any way to get info about compression while still leveraging auto decompression?