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  • the empty line is only for requests with body like POST request, to mark the start of the request body Commented Mar 16, 2018 at 19:28
  • @Juraj I tested it in Python by sending it over TCP with only a single pair of "\r\n" and the server didn't respond. Had to be "\r\n\r\n". Commented Mar 16, 2018 at 19:31
  • I looked up the protocol. It requires the empty line after the header for all requests Commented Mar 16, 2018 at 19:43
  • WiFiEsp] Connecting to api.thingspeak.com 13 [WiFiEsp] Disconnecting 3 //now it shows this in serial monitor Commented Mar 17, 2018 at 6:26
  • use the library github.com/mathworks/thingspeak-arduino Commented Mar 17, 2018 at 15:04