diff --git a/core/page.class.php b/core/page.class.php
index b2a8d662..d382caf2 100644
--- a/core/page.class.php
+++ b/core/page.class.php
@@ -183,7 +183,7 @@ class Page {
 	 * Display the page according to the mode and data given
 	 */
 	public function display() {
-		global $page;
+		global $page, $user;
 		
 		header("Content-type: ".$this->type);
 		header("X-Powered-By: SCore-".SCORE_VERSION);
@@ -196,7 +196,22 @@ class Page {
 
 		switch($this->mode) {
 			case "page":
-				header("Cache-control: no-cache");
+				header("Vary: Cookie, Accept-Encoding");
+				if(CACHE_HTTP) {
+					if($user->is_anonymous() && $_SERVER["REQUEST_METHOD"] == "GET") {
+						header("Cache-control: public, max-age=600");
+						header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 600) . ' GMT');
+					}
+					else {
+						#header("Cache-control: private, max-age=0");
+						header("Cache-control: no-cache");
+						header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
+					}
+				}
+				else {
+					header("Cache-control: no-cache");
+					header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
+				}
 				usort($this->blocks, "blockcmp");
 				$this->add_auto_html_headers();
 				$layout = new Layout();
diff --git a/ext/user/main.php b/ext/user/main.php
index 07f14867..0b1073fa 100644
--- a/ext/user/main.php
+++ b/ext/user/main.php
@@ -79,6 +79,11 @@ class UserPage extends SimpleExtension {
 			}
 			else if($event->get_arg(0) == "logout") {
 				set_prefixed_cookie("session", "", time()+60*60*24*$config->get_int('login_memory'), "/");
+				if(CACHE_HTTP) {
+					# to keep as few versions of content as possible,
+					# make cookies all-or-nothing
+					set_prefixed_cookie("user", "", time()+60*60*24*$config->get_int('login_memory'), "/");
+				}
 				log_info("user", "Logged out");
 				$page->set_mode("redirect");
 				$page->set_redirect(make_link());
diff --git a/index.php b/index.php
index 6a800999..48458b0c 100644
--- a/index.php
+++ b/index.php
@@ -62,6 +62,7 @@ define("COVERAGE", true);
 define("CONTEXT", false);
 define("CACHE_MEMCACHE", false);
 define("CACHE_DIR", false);
+define("CACHE_HTTP", false);
 define("VERSION", 'trunk');
 define("SCORE_VERSION", 's2hack/'.VERSION);
 define("COOKIE_PREFIX", 'shm');