diff --git a/.gitignore b/.gitignore
index 2f7896d..21ab51e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
 target/
+backend/httpd
+backend/proctest
+backend/threads
+backend/backend
diff --git a/backend/Makefile b/backend/Makefile
new file mode 100644
index 0000000..ed18223
--- /dev/null
+++ b/backend/Makefile
@@ -0,0 +1,45 @@
+.POSIX:
+.SUFFIXES:
+HARE=hare
+HAREFLAGS=
+
+DESTDIR=
+PREFIX=/usr/local
+BINDIR=$(PREFIX)/bin
+
+CC ?= cc
+CFLAGS = -O2 -Wall -fPIC
+
+classpathify = $(subst $(eval ) ,:,$1)
+
+HAREEXTRAPATH = $(HAREPATH)
+HAREEXTRAPATH += $(wildcard vendor/*)
+
+all: proctest httpd threads
+
+proctest: $(wildcard cmd/proctest/*.ha) $(SOURCES)
+	HAREPATH=$(call classpathify,$(HAREEXTRAPATH)) \
+	$(HARE) build $(HAREFLAGS) -o $@ cmd/$@/
+
+httpd: $(wildcard cmd/httpd/*.ha) $(SOURCES)
+	HAREPATH=$(call classpathify,$(HAREEXTRAPATH)) \
+	$(HARE) build $(HAREFLAGS) -o $@ cmd/$@/
+
+threads: $(wildcard cmd/threads/*.ha) $(SOURCES)
+	HAREPATH=$(call classpathify,$(HAREEXTRAPATH)) \
+	$(HARE) build $(HAREFLAGS) -o $@ cmd/$@/
+
+check:
+	HAREPATH=$(HAREPATH):$(HAREEXTRAPATH) \
+	$(HARE) test $(HAREFLAGS)
+
+clean:
+	rm -f proctest httpd threads
+
+install: httpd
+	install -Dm755 web $(DESTDIR)$(BINDIR)/httpd
+
+uninstall:
+	rm -f $(DESTDIR)$(BINDIR)/httpd
+
+.PHONY: all check clean install uninstall
diff --git a/backend/cmd/httpd/main.ha b/backend/cmd/httpd/main.ha
new file mode 100644
index 0000000..819a2f5
--- /dev/null
+++ b/backend/cmd/httpd/main.ha
@@ -0,0 +1,92 @@
+use getopt;
+use net;
+use net::ip;
+use net::http;
+use net::dial;
+use os;
+use memio;
+use io;
+use fmt;
+use bufio;
+use strings;
+
+const usage: [_]getopt::help = [
+	"HTTP server",
+	('a', "address", "listened address (ex: 127.0.0.1:8080)")
+];
+
+export fn main() void = {
+	const cmd = getopt::parse(os::args, usage...);
+	defer getopt::finish(&cmd);
+
+	let port: u16 = 8080;
+	let ip_addr: ip::addr4 = [127, 0, 0, 1];
+
+	for (let i = 0z; i < len(cmd.opts); i += 1) {
+		const opt = cmd.opts[i];
+		switch (opt.0) {
+		case 'a' =>
+			match (dial::splitaddr(opt.1, "")) {
+			case let value: (str, u16) =>
+				ip_addr = ip::parsev4(value.0)!;
+				port = value.1;
+			case dial::invalid_address =>
+				abort("Invalid address");
+			};
+		case => abort(); // unreachable
+		};
+	};
+
+	const server = match (http::listen(ip_addr, port)) {
+	case let this: *http::server =>
+		yield this;
+	case net::error => abort("failure while listening");
+	};
+	defer http::server_finish(server);
+
+	for (true) {
+		const serv_req = match (http::serve(server)) {
+		case let this: *http::server_request =>
+			yield this;
+		case net::error => abort("failure while serving");
+		};
+		defer http::serve_finish(serv_req);
+
+		let buf = memio::dynamic();
+		defer io::close(&buf)!;
+		handlereq(&buf, &serv_req.request);
+
+		http::response_write(
+			serv_req.socket,
+			http::STATUS_OK,
+			&buf,
+			("Content-Type", "text/plain")
+		)!;
+	};
+};
+
+export fn handlereq(buf: *io::stream, request: *http::request) void = {
+	fmt::fprintfln(buf, "Method: {}", request.method)!;
+	fmt::fprintfln(buf, "Path: {}", request.target.path)!;
+	fmt::fprintfln(buf, "Fragment: {}", request.target.fragment)!;
+	fmt::fprintfln(buf, "Query: {}", request.target.query)!;
+	fmt::fprintfln(buf, "Headers: <<EOF")!;
+	http::write_header(buf, &request.header)!;
+	fmt::fprintfln(buf, "EOF")!;
+
+	match (request.body) {
+	case void => void;
+	case let body: io::handle =>
+		fmt::fprintfln(buf, "Body: <<EOF")!;
+		for (true) {
+			match (bufio::read_line(body)!) {
+			case let line: []u8 =>
+				fmt::fprintln(buf, strings::fromutf8(line)!)!;
+				break;
+			case io::EOF =>
+				break;
+			};
+		};
+		fmt::fprintfln(buf, "EOF")!;
+	};
+};
diff --git a/backend/cmd/threads/main.ha b/backend/cmd/threads/main.ha
new file mode 100644
index 0000000..9c259c4
--- /dev/null
+++ b/backend/cmd/threads/main.ha
@@ -0,0 +1,45 @@
+use types::c;
+use fmt;
+
+export type pthread_t = u64;
+export type pthread_attr_t = opaque;
+export type pthread_fn = fn(nullable *opaque) nullable *opaque;
+
+export @symbol("pthread_create") fn pthread_create(thread: nullable *pthread_t, attr: nullable *pthread_attr_t, start_routine: *pthread_fn, arg: nullable *opaque) int;
+export @symbol("pthread_join") fn pthread_join(thread: pthread_t, nullable *nullable *opaque) int;
+
+fn thread_start(arg: nullable *opaque) nullable *opaque = {
+	fmt::println("hello from another thread")!;
+	return null;
+};
+
+export fn main() void = {
+	fmt::println("starting a thread")!;
+	let tid: pthread_t = 0;
+	let ret = pthread_create(&tid, null, &thread_start, null);
+	fmt::printfln("ret: {}", ret)!;
+
+	fmt::println("joining")!;
+	ret = pthread_join(tid, null);
+	fmt::printfln("ret: {}", ret)!;
+};
+
+
+// spawn a thread
+//
+// returns a handle or an error
+fn spawn(f: *pthread_fn) (join_handle | error) = {
+	void;
+};
+
+// join a thread
+//
+// no return value or an error on join
+fn join(handle: join_handle) (void | error) = {
+	void;
+};
+
+// detach a thread.
+fn detach(join_handle) (void | error) = {
+	void;
+};
diff --git a/backend/vendor/hare-http b/backend/vendor/hare-http
index 9237448..53a1384 160000
--- a/backend/vendor/hare-http
+++ b/backend/vendor/hare-http
@@ -1 +1 @@
-Subproject commit 923744872525b490925117ce597f10037208fc05
+Subproject commit 53a13840bddfbf8b11e4bb5704eb470d44bd63b9