Hi,

I've been using ESP8266 to send data to the server. I guess it should be done with the HTTP GET commands. Where should I indicate proxy's parameters on the ESP8266? I contacted Vicne (found the question on esp8266 forum last minute essay), but no answer so far.
Thanks.

I see that there's a price difference too: 02D has a higher price everywhere on the market. On the U and D modules, there is also an additional resistor. There's also an archived sample with the ESP-WROOM-02D and ESP-WROOM-02U writemyessay review if you are interested.

What have you tried so far?
Here are some useful links:
http://www.instructables.com/id/ESP8266 ... as-inputs/
http://www.123essay.biz GPIO0 high output section (in the right corner).
Perhaps they will help you.