[Seaside] Server-Timing filter goodie

[Esteban Maringolo]

As somebody else asked by private message, please note that this
just provides the support to performance timings, but it doesn't
measure anything internal to Seaside.

It is up to the user of the filter to do that. Maybe if this is useful
and stable, this can be added to the core of Seaside to track Seaside
internal processing, but that would require modifying the core code to
signal the appropriate notifications.

Regards!

Esteban A. Maringolo


On Fri, Jul 10, 2020 at 10:55 AM Karsten Kusche <karsten at heeg.de> wrote:
>
> Thanks, that looks super useful!
>
> Karsten
>
>
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> Am 10. Juli 2020 um 15:49:04, Esteban Maringolo (emaringolo at gmail.com) schrieb:
>
> Hi People,
>
> I implemented a small request filter to support the Server-Timing
> header (and web development tools integration).
>
> See more here:
> https://github.com/eMaringolo/seaside-server-timing
>
> Note: I think there is a bug in the conversion of the headers from a
> WAResponse to ZnResponse in ZnZincServerAdaptor, since if there are
> several headers with the same name in aWAResponse, but only the last
> one remains in ZnResponse, because it does an `at:put` instead of
> adding several headers or merging them all together (as with the
> 'Set-Cookie' header).
>
> By doing this I also learned that there is a `Trailer` header, that
> allows you to add a header that behaves like a footer in a chunked
> response. This would be useful to track some performance indicators at
> the very end of the process. But I don't know if this Trailer header
> is currently supported.
>
> Regards!
>
> Esteban A. Maringolo
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