How to send http strings

Correct is an IP speed dome.
You can see the video using the web and contrl it send HTTP strings.
I have a 6 push buttons control, one to turn on and off the camera (using another arduino ethernet as server and data logger conected to the camera) and the other 5 are to send the camera to preset positions.
Using one explorer and send the strings directly is ok.
The only part that i have missing is the way to send that strings using the arduino.
Can you help? Or point me in a direction.
Thanks.
Timóteo