Hi Bart,
My hypothesis was that using TileArcGISRest was not the correct way to access that endpoint, but it wasn’t clear which kind of OL “source” was the correct one to use. Thanks for referring me to the “XYZ” source, and to your https://github.com/planetfederal/ole tool. I got your tool installed on my system, substituted URL of the service I’m trying to access as the “caps-url” in ‘examples/layer-generator.html,’ and then ran examples/layer-generator.html It was then able to fetch tiles from the MassGIS tile server successfully. I stepped through your code in the debugger, and sure enough, execution went through “createXYZSource” rather than “createArcGISRestSource.” With this info in-hand, I should be pretty much unblocked. I’ll let you know how things go. Thanks again for your help. Best regards, Ben *From:* Bart van den Eijnden [mailto:bart...@osgis.nl] *Sent:* Wednesday, September 25, 2019 1:38 PM *To:* Benjamin Krepp <bkr...@ctps.org>; openlayers-users@lists.osgeo.org *Cc:* Saul Farber <s...@peoplegis.com> *Subject:* Re: [OpenLayers-Users] CORB problem with TileArcGISRest layer in OpenLayers 5 client Since that service does not support the export endpoint [1], you cannot use this source type, you need to use an XYZ source instead. Have a look at: https://github.com/planetfederal/ole it can generate the layer config for you, based on the capabilities from the service. Relevant code part is here: https://github.com/planetfederal/ole/blob/master/src/LayerGenerator.js#L56 Best regards, Bart [1] https://tiles.arcgis.com/tiles/hGdibHYSPO59RG1h/arcgis/rest/services/MassGIS_Basemap_Detailed_Features/MapServer/export gives a 404 On 25-09-19 16:36, Benjamin Krepp 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 -- *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. *
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