openlayers/openlayers — comment on commit 57ae02f3812280d25f521f4f4ba9dc1e358e4a79
File:  line 0
By ahocevar:

@fredj: @bartvde referenced the wrong change, and the issue was that the MapQuest layer in gxp uses Layer.OSM with a custom url from a server that does not send Access-Control-Allow-Origin headers. And Layer.OSM sets the crossOrigin keyword by default.