[Geoserver-users] GeoWebCache - How to hide/replace 404 errors for missing tiles

GeoServer GeoServer User
1

Hello,

I would like to know if there is a setting or a trick to have GeoWebCache send blank tiles instead of a 404 error when a request does not match the area of the data.

I have the option to put a reverse proxy in front of GeoServer to do the trick but I would prefer to avoid adding a new component in my architecture for this requirement.

···

Alexandre Gacon

2

Hi Alexandre,
you don’t say which service you’re using (that matters)…

For example, returning 404 is a requirement from the WMTS specification, omitting that would make the server non compliant.
An explicit test for it is mandated as part of the “Abstract Test Suite”:

···

Regards,

Andrea Aime

==
GeoServer Professional Services from the experts!

Visit http://bit.ly/gs-services-us for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions Group
phone: +39 0584 962313

fax: +39 0584 1660272

mob: +39 339 8844549

https://www.geosolutionsgroup.com/

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

3

Hi Andrea,

We indeed made tests with wmts, through the viewer available in GeoServer.

I will check with other services if we can have a behaviour which is ok with the customer requirements.

Alexandre

Le mar. 4 avr. 2023 à 09:51, Andrea Aime <andrea.aime@anonymised.com> a écrit :

Hi Alexandre,
you don’t say which service you’re using (that matters)…

For example, returning 404 is a requirement from the WMTS specification, omitting that would make the server non compliant.
An explicit test for it is mandated as part of the “Abstract Test Suite”:

a) Test purpose: Verify that when a request contains a TileRow or TileCol incorrect, then the server throws an exception.
b) Test method: When a request contains a TileRow or TileCol greater or equal to MatrixHeight and MatrixWidth respectively for the selected TileMatrix, then the server throws an exception (code= TileOutOfRange) in Procedure Oriented Architectural Style or a HTTP 404 File not found in Resource Oriented Architectural Style.

So it’s actually a service exception when using KVP style, and a 404 when using the RESTFul style.

In any case, as far as I know there is no way to change the existing behavior (right or wrong which might be) other than changing the code itself.
We could even have a flag to make the server more lenient for example, as long as it’s clear that could have compliance consequences (if it’s WMTS restulf that we are talking about).

Cheers
Andera

On Tue, Apr 4, 2023 at 8:33 AM Alexandre Gacon <alexandre.gacon@anonymised.com> wrote:

Hello,

I would like to know if there is a setting or a trick to have GeoWebCache send blank tiles instead of a 404 error when a request does not match the area of the data.

I have the option to put a reverse proxy in front of GeoServer to do the trick but I would prefer to avoid adding a new component in my architecture for this requirement.

–

Alexandre Gacon

Geoserver-users mailing list

Please make sure you read the following two resources before posting to this list:

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

Geoserver-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users

–

Regards,

Andrea Aime

==
GeoServer Professional Services from the experts!

Visit http://bit.ly/gs-services-us for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions Group
phone: +39 0584 962313

fax: +39 0584 1660272

mob: +39 339 8844549

https://www.geosolutionsgroup.com/

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