Thanks for the very helpful information Andrea! Chris
From: Andrea Aime [mailto:[email protected]] Sent: 14 August 2019 08:16 To: Chris Buckmaster Cc: GeoServer Mailing List List Subject: Re: [Geoserver-users] GetFeatureInfo WMS v1.3.0 issue with I and J parameters 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 <[email protected]<mailto:[email protected]>> 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 Think before you print this. We are committed to being transparent about why and how we collect and use your personal data. Please see our Privacy Statement for further details. This message, and associated files, is intended only for the use of the individual or entity to which it is addressed and may contain information that is confidential or subject to copyright. If you are not the intended recipient please note that any copying or distribution of this message, or files associated with this message, is strictly prohibited. If you have received this message in error, please notify us immediately. Opinions, conclusions and other information in this message that do not relate to the official business of Runnymede Borough Council shall be understood as neither given nor endorsed by Runnymede Borough Council. _______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html 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 [email protected]<mailto:[email protected]> https://lists.sourceforge.net/lists/listinfo/geoserver-users -- 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 ------------------------------------------------------- Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia. This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.
_______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html 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 [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-users
