Hi Chris,
GWC is running inside GeoServer, that may make you think that they play by
the same rules... but they don't.
GeoServer WMS is accessible at this address, and the request works:

https://maps.runnymede.gov.uk/geoserver/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=council%3Apolling_districts&LAYERS=council%3Apolling_districts&SRS=EPSG%3A27700&TILED=true&INFO_FORMAT=application%2Fjson&I=174&J=127&WIDTH=256&HEIGHT=256&CRS=EPSG%3A27700&STYLES=&BBOX=492761%2C164864%2C499929%2C172032

The "full WMS" GWC extension you're using is instead managed directly by
GWC, it's not sharing
code with GeoServer, and has a different behavior. I cannot find
indications as to which versions of WMS are supported
on that endpoint, but it's really old and has not been touched in ages, by
that I'm guessing it was designed to work
only with WMS 1.1.
Indeed the code has no indication of supporting I and J, see here:

https://github.com/GeoWebCache/geowebcache/blob/master/geowebcache/wms/src/main/java/org/geowebcache/service/wms/WMSService.java#L377

I also don't see support for the WMS 1.3 own version of axis flipping
(EPSG:4326 interpreted as north/east)... which makes me notice another
thing,
in WMS 1.3 the output crs is called "CRS" not "SRS", GeoServer is tolerant
about the difference (same codebase implements both services) but
the properly formed request would be:

https://maps.runnymede.gov.uk/geoserver/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=council%3Apolling_districts&LAYERS=council%3Apolling_districts&CRS=EPSG%3A27700&TILED=true&INFO_FORMAT=application%2Fjson&I=174&J=127&WIDTH=256&HEIGHT=256&CRS=EPSG%3A27700&STYLES=&BBOX=492761%2C164864%2C499929%2C172032

Long story short:

   - If you want to use WMS 1.3 stick to the GeoSever WMS
   - If you want to use GWC own WMS stick to WMS 1.1
   - If you want to use both at the same time, WMS 1.3 support for GWC
   needs to be written (could be a bunch of extra ifs in the existing code,
   most of the behavior is similar).. pull requests welcomed ;-)

Cheers
Andrea



On Tue, Aug 13, 2019 at 7:53 PM Chris Buckmaster via Geoserver-users <
geoserver-users@lists.sourceforge.net> wrote:

> Hi
>
>
>
> I am trying to send a GetFeatureInfo request using WMS v1.3.0 via
> OpenLayers but am receiving the below error message from GeoWebCache:
>
>
>
> “400: The parameters for x and y must both be positive integers.”
>
>
>
> On looking at the GeoServer reference manual
> <https://docs.geoserver.org/stable/en/user/services/wms/reference.html>,
> when working with v1.3.0 it should be using the ‘I’ and ‘J’ parameters
> rather than ‘X’ and ‘Y’ – if I change it to ‘X’ and ‘Y’ it works but
> OpenLayers uses ‘I’ and ‘J’ for its WMS request.
>
>
>
> I am using GeoServer v2.13.1 and OpenLayers v5.3.
>
>
>
> Please see examples below:
>
>
>
> (Using WMS version 1.3.0 and I/J parameters – not working)
>
>
> https://maps.runnymede.gov.uk/geoserver/gwc/service/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=council%3Apolling_districts&LAYERS=council%3Apolling_districts&SRS=EPSG%3A27700&TILED=true&INFO_FORMAT=application%2Fjson&I=174&J=127&WIDTH=256&HEIGHT=256&CRS=EPSG%3A27700&STYLES=&BBOX=492761%2C164864%2C499929%2C172032
>
>
>
> (Using WMS version 1.3.0 and X/Y parameters – working)
>
>
> https://maps.runnymede.gov.uk/geoserver/gwc/service/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=council%3Apolling_districts&LAYERS=council%3Apolling_districts&SRS=EPSG%3A27700&TILED=true&INFO_FORMAT=application%2Fjson&X=174&Y=127&WIDTH=256&HEIGHT=256&CRS=EPSG%3A27700&STYLES=&BBOX=492761%2C164864%2C499929%2C172032
>
>
>
>
>
>
>
>
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-- 

Regards, Andrea Aime == GeoServer Professional Services from the experts!
Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime
@geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054
Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339
8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it
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If you want to request a feature or an improvement, also see this: 
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer


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