Try this code to start. It downloads Google home every 30 seconds. I know it will work with other SPI compatible devices.
http://www.arduino.cc/playground/Code/WebClient
Change the network settings, the server to your server ip and page.
After the Serial.begin(9600) call in setup, add this:
// disable TFT SPI
pinMode(6,OUTPUT);
digitalWrite(6,HIGH);
Your code has pin 6 as the slave select for the TFT display. Is that still correct?
Does that part work ok?