I wonder how practical it would be to replicate this functionality in
OL3?  Maybe something that could plug into a tile layer to generate a
vector overlay where each request is represented as a feature.  More
work than just using OL2 but it might be worth suggesting to the OL
developers.

On 2017-10-05 06:36 AM, Ian Turton wrote:
> Yes, please - I was struggling with this the other day.
>
> Ian
>
> On 5 October 2017 at 14:31, Andrea Aime <andrea.a...@geo-solutions.it
> <mailto:andrea.a...@geo-solutions.it>> wrote:
>
>     Hi,
>     I would like to propose we bring back the OL2 preview as an
>     alternative output format "application/openlayers2".
>
>     The reason is quite simple, I'm tired of pulling hairs with the
>     current canvas based preview.
>     I just spend some days debugging issues that were happening mostly
>     when doing requests in tiled mode,
>     and hunting down the right request in the network logs has been
>     quite a drag of time.
>
>     Yes, there is a system variable to bring back the OL2 preview, but
>     it's not the default, cannot be easily
>     activated on a production system. 
>
>     Also, at least from a didactic perspective, it's nice to pull up
>     OL2 and tell the students to just right click on the 
>     map/the tiles and see that it's really just a WMS call, rather
>     than pulling up the dev tools and also explain
>     them the network view in the process.
>
>     Of course I'm not proposing to simply go back to OL2, but in some 
>     ways the OL3 preview is not
>     a full replacement for the old OL2, so imho best to have them both
>     available at the same time
>     by just changing a request parameter, keeping OL2 as a possible
>     option while OL3+ remains 
>     the default for previews.
>
>     Objections? :-)
>
>     Cheers
>     Andrea
>
>     PS: another very annoying thing is that the OL3 preview just shows
>     nothing when 
>     a request fails, instead of a "broken image" like in OL2, but I
>     guess for this there are solutions,
>     like using "error in image" for exceptions or something like that,
>     sounds more like a bug in need
>     of fixing instead of an architectural problem.
>     ==
>
>     GeoServer Professional Services from the experts! Visit
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>     @geowolfTechnical LeadGeoSolutions S.A.S.Via di Montramito
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>     
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>
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> Ian Turton
>
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-- 
Kevin Michael Smith
<smit...@draconic.ca>

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