The tiles.arcgis.com URL seems to be invalid because it's returning content-type: text/html instead of a tile, as you observed. I would try to solve that before even thinking about CORB/CORS problem. Maybe that problem will go away when you are getting a tiles response (the http headers will likely be different as well).
On Wed, Sep 25, 2019 at 8:37 AM Benjamin Krepp <bkr...@ctps.org> wrote: > Dear colleagues, > > > > I’m running into difficulty using a tiled basemap layer with an > TileArcGISRest data source in an OpenLayers 5 client. > > I’ve able to successfully use this layer in OpenLayers 2 clients, and > don’t’ understand the problem I’m running into and what needs to be done to > address it. > > The layer in question is one of MassGIS’s (the Massachusetts State GIS > Agency’s) tiled basemaps. It is described here: > https://www.mass.gov/service-details/massgis-base-map > > > > My sample OL 2 client, which works just fine, may be found here: > https://www.ctps.org/geoserver/www/apps/MassGIS_basemap_OL_v2/index.html > > My sample OL 5 client, which runs into errors, may be found here: > https://www.ctps.org/geoserver/www/apps/MassGIS_basemap_OL_v5/index.html > > The code for my OL 5 client is based on a sample on the OpenLayers > website: https://openlayers.org/en/latest/examples/arcgis-tiled.html > > > > When run in the Chrome browser, the OL 5 client gets cross-origin read > blocking (CORB) errors, reported in the developer’s console: > > > > Cross-Origin Read Blocking (CORB) blocked cross-origin response > https://tiles.arcgis.com/tiles/hGdibHYSPO59RG1h/arcgis/rest/services/MassGIS_Basemap_Detailed_Features/MapServer/export?F=image&FORMAT=PNG32&TRANSPARENT=true&SIZE=256%2C256&BBOX=-71.103515625%2C42.275390625%2C-71.015625%2C42.36328125&BBOXSR=4326&IMAGESR=4326&DPI=90 > with MIME type text/html. See > https://www.chromestatus.com/feature/5629709824032768 for more details. > > > > The layer also fails to render when the sample client is run in Firefox, > IE, Edge, and Opera. > > I checked the developer’s console in Firefox, and there no CORB errors are > reported. Looking at the responses to the requests for tiles in the > ‘Network’ tab, I see the following: > > <html> > > <body> > > <h2>Error</h2> > > <div class=”restbody”> > > <h3>Operation not supported.</h3><br/> > > <b> Code: <b>404<br/><br/> > > </div> > > </body> > > </html> > > So, in spite of the lack of an error message in the console, it’s clear > that the server isn’t sending tiles back in response to requests. > > > > Due to the big changes in the OpenLayers API between versions 2 and 3, my > first hypothesis is that I’ve not correctly “translated” my OL 2 code into > OL 3/4/5. > > This having been said, it’s not clear to me what a “correct” translation > might look like – the sample on the OL site noted above is the only thing > I’ve been able to find to use as a model. > > > > If anyone can shed light on what I might be doing wrong here, it would be > much appreciated. > > > > Thanks and best regards, > > Ben > > > > > > *Benjamin Krepp* | Chief GIS Programmer/Analyst > > CENTRAL TRANSPORTATION PLANNING STAFF > > 857.702.3670 | *bkr...@ctps.org <bkr...@ctps.org>* > > www.ctps.org > > > > [image: email_logos_2015] > > > > > > *Please be advised that the Massachusetts Secretary of State considers > e-mail to be a public record, and therefore subject to the Massachusetts > Public Records Law, M.G.L. c. 66 § 10. * > _______________________________________________ > Users mailing list > us...@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/openlayers-users -- Alex G Rice rice.gu...@gmail.com +1 505-603-5639
_______________________________________________ Users mailing list us...@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/openlayers-users
