Yes it can. In fact, that’s exactly how the firmware makes weather calls and implements remote stations. It’s done by using the ether.browseUrl method:
https://github.com/OpenSprinkler/OpenSprinkler-Firmware/blob/master/weather.cpp#L153
https://github.com/OpenSprinkler/OpenSprinkler-Firmware/blob/master/OpenSprinkler.cpp#L1035