Uncaught SyntaxError: Unexpected token : when loading an Esri Basemap

[jubasse]

• Browser and version:

Chrome 51

• Version of Leaflet (L.version):

^1.3.3

• Version of esri Leaflet (L.esri.VERSION):

^2.2.3 updated today to the last version

Steps to reproduce the error:

instanciate the map with a featureLayer.
Until today i do not have any problem, but today, it seems like the attribution url doesn't send the same data anymore, because in the library script, we have the _getAttributionData that send a jsonp request to arcgis, but now the given url https://static.arcgis.com/attribution/World_Topo_Map?callback=window._EsriLeafletCallbacks.c0&f=pjson returns a json, and this json isn't recognize (header text/plain).

I think that we should now use an http request to get data instead of jsonp..

• Optional: I'm not using the CDN, I'm loading/bundling the library using: npm

[jgravois]

thanks for the report.

my hunch is that this is a bug introduced during yesterday's ArcGIS Online release, but i'll need to confirm.

related: #1064

[jgravois]

it turns out we made a conscious choice to turn off JSONP support on static.arcgis.com to retire some old infrastructure and optimize our CDN.

in Esri Leaflet land we should have been using L.esri.request() all along, but i can't go back in time. folks are going to have to upgrade to v2.2.4 to ensure their app continues to display attribution dynamically.

thanks for opening this issue to bring it to my attention!

[zbeat]

@jgravois Thx for the quick fix, as well as this additional info on the AGOL change:

it turns out we made a conscious choice to turn off JSONP support on static.arcgis.com to retire some old infrastructure and optimize our CDN.

[jubasse]

@jgravois Thanks for the quick fix !