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Re: [jetty-users] proxy: GzipContentTransformer and Content-Length headers
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Thanks for the reference -- maybe I can just include that interceptor in my Server and it'll all just work.
Failing that, I can just copy the logic.
One key bit was setting Content-Length to -1 -- I hadn't figured out how to compute it
without buffering the entire response, and I guess it's not surprising the answer is "you can't".
> On Nov 3, 2017, at 3:02 PM, Greg Wilkins <gregw@xxxxxxxxxxx> wrote:
>
>
> Steven,
>
> Jetty GzipContentTransformer is very much just a component in what must be a bigger solution dealing with headers and lengths. For example a middle man might inflate content, examine it and then deflate it again before passing it on, so headers might not need to be adjusted. Or it might inflate/deflate content, in which case headers do need to be adjusted.
>
> You can see what we do serverside in https://github.com/eclipse/jetty.project/blob/jetty-9.4.x/jetty-server/src/main/java/org/eclipse/jetty/server/handler/gzip/GzipHttpOutputInterceptor.java#L153-L193
>
> We use the the "incorrect" widely-accepted 'Content-Encoding' because it works better with browsers :)
>
> cheers
>
>
> On 4 November 2017 at 05:22, Steven Schlansker <stevenschlansker@xxxxxxxxx> wrote:
> I'm trying to use the GzipContentTransformer to implement transparent gzip-ing of our backend responses.
>
> It looks like the code handles the actual compression fine, but does not handle changing the HTTP headers to match the transformed input.
> Additionally, there's multiple 'styles' of transparent gzipping, the "incorrect" widely-accepted 'Content-Encoding' and the not-widely-supported-but-more-correct Transfer-Encoding approach.
>
> Once you start digging in to exactly what to do, you also have to start munging ETags.
> Then you find a long history of both nginx and mod_deflate[1] getting it wrong...
>
> Does the Jetty community have an example, or any recommendations?
> I looked for uses of GzipContentTransformer but didn't find any samples.
>
> [1] https://bz.apache.org/bugzilla/show_bug.cgi?id=39727
>
>
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> --
> Greg Wilkins <gregw@xxxxxxxxxxx> CTO http://webtide.com
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