2 HttpResponse - send data with caching headers
11 HttpResponse::setCache(true);
12 HttpResponse::setCacheControl('public', 3600);
13 HttpResponse::setData('foobar');
18 ETag: "3858f62230ac3c915f300c664312c63f"
19 Cache-Control: public, must-revalidate, max_age=3600
20 Last-Modified: %s, %d %s 20%d %d:%d:%d GMT