Processing and the Internet

In the Processing website I found out this piece of code that requests the HTTP headers of a page and prints out the results:
I will report here the code which is shown on the Processing website at this address: HTTP CLIENT
import processing.net.*;

Client client;

void setup()
{
size(200, 200);
noStroke();
// Open a TCP socket to the host:
client = new Client(this, […]