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
I'm actually using the WIZnet W550io Ethernet module.
What is the simplest way to tell if the Ethernet module has a internet connection?
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