diff --git a/bin/uce_fastcgi.debug.linux.bin b/bin/uce_fastcgi.debug.linux.bin
index 710a598..5e5a9bb 100755
Binary files a/bin/uce_fastcgi.debug.linux.bin and b/bin/uce_fastcgi.debug.linux.bin differ
diff --git a/src/lib/compiler.h b/src/lib/compiler.h
index 652a7ac..8b740f6 100644
--- a/src/lib/compiler.h
+++ b/src/lib/compiler.h
@@ -1,4 +1,4 @@
-#define RENDER() extern "C" void render()
+#define RENDER() extern "C" void render(DTree& call)
 
 string process_html_literal(Request* context, SharedUnit* su, string content)
 {
@@ -253,7 +253,7 @@ SharedUnit* get_shared_unit(Request* context, string file_name)
 	return(su);
 }
 
-void compiler_invoke(Request* context, string file_name)
+void compiler_invoke(Request* context, string file_name, DTree& call_param)
 {
 	if(file_name[0] != '/')
 	{
@@ -270,6 +270,7 @@ void compiler_invoke(Request* context, string file_name)
 	}
 	else if(!su->on_render)
 	{
+		context->header["Content-Type"] = "text/plain";
 		context->print("Compiler error: "+su->compiler_messages);
 	}
 	else
@@ -281,7 +282,7 @@ void compiler_invoke(Request* context, string file_name)
 			string prev_wd = get_cwd();
 			set_cwd(su->src_path);
 			su->on_setup(context);
-			su->on_render();
+			su->on_render(call_param);
 			set_cwd(prev_wd);
 		}
 	}
diff --git a/src/lib/sys.h b/src/lib/sys.h
index dbc827b..ca3b381 100644
--- a/src/lib/sys.h
+++ b/src/lib/sys.h
@@ -1,5 +1,10 @@
 #include <errno.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
 
 string shell_exec(string cmd)
 {
@@ -222,4 +227,94 @@ u64 parse_time(string time_string)
 	return(int_val(trim(shell_exec("date -u -d '"+time_string+"' +'%s'"))));
 }
 
+u64 socket_connect(string host, short port)
+{
 
+	/*struct addrinfo {
+		int              ai_flags;
+		int              ai_family;
+		int              ai_socktype;
+		int              ai_protocol;
+		socklen_t        ai_addrlen;
+		struct sockaddr *ai_addr;
+		char            *ai_canonname;
+		struct addrinfo *ai_next;
+	};*/
+
+    auto sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	if(sockfd < 0)
+    {
+		echo("SOCKET ERROR (could not open socket)\n");
+		perror("SOCKET ERROR ");
+		return(0);
+	}
+
+	struct sockaddr_in addr = {0};
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(port);
+	addr.sin_addr.s_addr = inet_addr(host.c_str());
+
+    if(connect(sockfd, (struct sockaddr*) &addr, sizeof(addr)) < 0)
+    {
+		echo("SOCKET ERROR (could not connect to address " + string(host) + ":" + std::to_string(port) + ")\n");
+		perror("SOCKET ERROR ");
+		return(0);
+	}
+	context->resources.sockets.push_back(sockfd);
+	return(sockfd);
+}
+
+void socket_close(u64 sockfd)
+{
+	close(sockfd);
+}
+
+bool socket_write(u64 sockfd, string data)
+{
+	return(write(sockfd, data.c_str(), data.length()) >= 0);
+}
+
+string socket_read(u64 sockfd, u32 max_length = 1024*128, u32 timeout = 1)
+{
+	struct timeval tv;
+	tv.tv_sec = timeout;
+	tv.tv_usec = 0;
+	setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof tv);
+	char buf[max_length+1];
+	auto byte_count = recv(sockfd, buf, sizeof(buf), 0);
+	if(byte_count > 0)
+	{
+		buf[byte_count] = 0;
+		string result(buf, byte_count+1);
+		return(result);
+	}
+	return("");
+}
+
+u64 memcache_connect(string host = "127.0.0.1", short port = 11211)
+{
+	return(socket_connect(host, port));
+}
+
+string memcache_get_raw(u64 connection, string command)
+{
+	socket_write(connection, command+"\r\n");
+	return(socket_read(connection)); // FIXME: do multi-chunk until END line is received!
+}
+
+bool memcache_set(u64 connection, string key, string value, u64 expires_in = 60*60)
+{
+	// to do: escape key string
+	socket_write(connection,
+		// set KEY META_DATA EXPIRY_TIME LENGTH_IN_BYTES
+		string("set ") + (key) + " 0 " + std::to_string(expires_in) + " " + std::to_string(value.length()) + "\r\n" +
+		value + "\r\n");
+	return("STORED" == trim(socket_read(connection)));
+}
+
+string memcache_get(u64 connection, string key)
+{
+	// to do: escape key string
+	auto res = memcache_get_raw(connection, string("get ")+key);
+
+}
diff --git a/src/lib/types.h b/src/lib/types.h
index ec5a956..8e5ce02 100644
--- a/src/lib/types.h
+++ b/src/lib/types.h
@@ -39,11 +39,10 @@ typedef long long s64;
 typedef std::map<string, string> StringMap;
 typedef std::list<string> StringList;
 
-typedef void (*invoke_handler)(string file_name);
-
 struct Request;
+struct DTree;
 
-typedef void (*call_handler)();
+typedef void (*call_handler)(DTree& call_param);
 typedef void (*request_handler)(Request* request);
 
 string to_string(u64 v) { return(std::to_string(v)); }
@@ -107,8 +106,6 @@ struct ServerState {
 
 };
 
-void compiler_invoke(Request* context, string file_name);
-
 struct URI {
 
 	StringMap query;
@@ -145,6 +142,8 @@ string to_hex(ITYPE w, size_t hex_len = sizeof(ITYPE)<<1)
 
 #include "dtree.h"
 
+void compiler_invoke(Request* context, string file_name, DTree& call_param);
+
 struct Request {
 
 	ServerState* server;
@@ -172,9 +171,19 @@ struct Request {
 	f64 time_start;
 	f64 time_end;
 
+	struct Resources {
+		std::vector<u64> sockets;
+	} resources;
+
 	void invoke(string file_name)
 	{
-		compiler_invoke(this, file_name);
+		DTree call_param;
+		compiler_invoke(this, file_name, call_param);
+	}
+
+	void invoke(string file_name, DTree& call_param)
+	{
+		compiler_invoke(this, file_name, call_param);
 	}
 
 	void print(string s)
@@ -182,6 +191,12 @@ struct Request {
 		out.append(s);
 	}
 
+	~Request()
+	{
+		for(auto& sockfd : resources.sockets)
+			close(sockfd);
+	}
+
 };
 
 typedef Request FastCGIRequest;
diff --git a/test/index.uce b/test/index.uce
index fc97e3d..9124c20 100644
--- a/test/index.uce
+++ b/test/index.uce
@@ -19,6 +19,7 @@ RENDER()
 			<li><a href="session.uce">Session</a></li>
 			<li><a href="dtree.uce">DTree</a></li>
 			<li><a href="json.uce">JSON</a></li>
+			<li><a href="memcached.uce">Memcached</a></li>
 		</ul>
 		<pre><?= var_dump(context->params) ?></pre>
 	</>
diff --git a/test/memcached.uce b/test/memcached.uce
new file mode 100644
index 0000000..9f8eb2c
--- /dev/null
+++ b/test/memcached.uce
@@ -0,0 +1,37 @@
+
+
+RENDER()
+{
+	DTree t;
+
+	<>
+		<link rel="stylesheet" href='style.css'></link>
+		<h1>
+			<a href="index.uce">UCE Test</a>:
+			MemcacheD
+		</h1>
+
+		Stats:
+
+		<pre><?
+
+			auto sfd = memcache_connect();
+
+			echo(memcache_get_raw(sfd, "stats"));
+
+		?></pre>
+
+		Set/Get:
+
+		<pre><?
+
+			memcache_set(sfd, "test_key", "test_value");
+			echo(memcache_get_raw(sfd, "get test_key"));
+
+		?></pre>
+
+		Params
+		<pre><?= var_dump(context->params) ?></pre>
+	</>
+
+}
diff --git a/test/text-json.uce b/test/text-json.uce
deleted file mode 100644
index e683ac3..0000000
--- a/test/text-json.uce
+++ /dev/null
@@ -1,12 +0,0 @@
-
-
-RENDER()
-{
-
-	DTree t;
-
-	echo(json_encode(t));
-
-	echo(string("PATH: ") + context->server->config.COMPILER_SYS_PATH + "\n");
-	
-}
diff --git a/todo.txt b/todo.txt
index 4dcc579..d0f6344 100644
--- a/todo.txt
+++ b/todo.txt
@@ -4,7 +4,6 @@ Library
 - mysql
 - sha1 / md5 / meow
 - cache
-- json_encode / json_decode
 - curl
 - random
 - pseudorandom
@@ -14,8 +13,6 @@ Bugs
 =================================
 - shell_escape()
 - we crash on illegal paths
-- you should not be able to invoke() outside of DOCUMENT_ROOT
-- invoke path should not be the same as cwd (cwd should be path of entry point file)
 
 
 Framework