Have you verified that the ESP8266 is able to connect to the internet and do get requests? That's a good thing to check first.
(edit: if using ESP8266 only - didn't know you were using wiznet) Did you put a cap on across power + ground (there are pads for a 1210 cap on the shim - I think you can (with awkward part placement) get a cap as small as 805 across those pads). Ceramic cap in value 1uf to 10-20uf
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Have you verified that the ESP8266 is able to connect to the internet and do get requests? That's a good thing to check first.
(edit: if using ESP8266 only - didn't know you were using wiznet) Did you put a cap on across power + ground (there are pads for a 1210 cap on the shim - I think you can (with awkward part placement) get a cap as small as 805 across those pads). Ceramic cap in value 1uf to 10-20uf