diff --git a/cmd/httpd/sandbox+darwin.ha b/cmd/httpd/sandbox+darwin.ha
new file mode 100644
index 0000000..a934a4c
--- /dev/null
+++ b/cmd/httpd/sandbox+darwin.ha
@@ -0,0 +1,45 @@
+use io::{mode};
+use io;
+use os::exec;
+use os;
+use strings;
+use temp;
+use fs;
+use fmt;
+
+export fn run_code(code: str) (str, str) = {
+	let tmp_dir = temp::dir();
+	defer os::rmdirall(tmp_dir)!;
+
+	let path = fmt::asprintf("{}/main.ha", tmp_dir);
+	defer free(path);
+
+	let fp = os::create(path, 0o644)!;
+	io::writeall(fp, strings::toutf8(code))!;
+	io::close(fp)!;
+
+	let cmd = exec::cmd("hare", "run", path)!;
+
+	let stdout_pipe = exec::pipe();
+	exec::addfile(&cmd, os::stdout_file, stdout_pipe.1);
+
+	let stderr_pipe = exec::pipe();
+	exec::addfile(&cmd, os::stderr_file, stderr_pipe.1);
+
+	let proc = exec::start(&cmd)!;
+	io::close(stdout_pipe.1)!;
+	io::close(stderr_pipe.1)!;
+
+	let status = exec::wait(&proc)!;
+
+	let stdout_data = io::drain(stdout_pipe.0)!;
+	io::close(stdout_pipe.0)!;
+
+	let stderr_data = io::drain(stderr_pipe.0)!;
+	io::close(stderr_pipe.0)!;
+
+	let stdout = strings::fromutf8(stdout_data) as str;
+	let stderr = strings::fromutf8(stderr_data) as str;
+
+	return (stdout, stderr);
+};
diff --git a/cmd/httpd/sandbox+linux.ha b/cmd/httpd/sandbox+linux.ha
new file mode 100644
index 0000000..0f05086
--- /dev/null
+++ b/cmd/httpd/sandbox+linux.ha
@@ -0,0 +1,115 @@
+use fmt;
+use io;
+use os;
+use os::exec;
+use strings;
+use temp;
+use unix;
+
+const static_args = [
+    "--ro-bind", "/usr", "/usr",
+    "--dir", "/tmp",
+    "--dir", "/var",
+    "--symlink", "../tmp", "/var/tmp",
+    "--proc", "/proc",
+    "--dev", "/dev",
+    "--ro-bind", "/etc/resolv.conf", "/etc/resolv.conf",
+    "--symlink", "usr/lib", "/lib",
+    "--symlink", "usr/lib64", "/lib64",
+    "--symlink", "usr/bin", "/bin",
+    "--symlink", "usr/sbin", "/sbin",
+    "--unshare-all",
+    "--die-with-parent",
+    "--clearenv",
+    "--setenv", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+    "--setenv", "HAREPATH", "/usr/local/src/hare/stdlib",
+];
+
+const HARE_COMMAND = "/usr/local/bin/hare";
+
+/// Default command timeout in seconds.
+const DEFAULT_TIMEOUT = 30;
+
+export fn run_code(code: str) (str, str) = {
+	let (uid, gid) = getids();
+
+	let args = strings::dupall(static_args);
+
+	let app_dir = shared_app_dir(&args);
+	// defer runs in reverse order.
+	defer os::rmdirall(app_dir)!;
+
+	home_dir(&args, uid);
+
+	let code_path = fmt::asprintf("{}/main.ha", app_dir);
+	defer free(code_path);
+	let code_fp = os::create(code_path, 0o644)!;
+	io::writeall(code_fp, strings::toutf8(code))!;
+	io::close(code_fp)!;
+
+	command(&args, "/app/main.ha");
+
+	let cmd = exec::cmd("bwrap", args...)!;
+
+	let stdout_pipe = exec::pipe();
+	exec::addfile(&cmd, os::stdout_file, stdout_pipe.1);
+
+	let stderr_pipe = exec::pipe();
+	exec::addfile(&cmd, os::stderr_file, stderr_pipe.1);
+
+	let proc = exec::start(&cmd)!;
+	io::close(stdout_pipe.1)!;
+	io::close(stderr_pipe.1)!;
+
+	let stdout_data = io::drain(stdout_pipe.0)!;
+	io::close(stdout_pipe.0)!;
+
+	let stderr_data = io::drain(stderr_pipe.0)!;
+	io::close(stderr_pipe.0)!;
+
+	let status = exec::wait(&proc)!;
+
+	let stdout = strings::fromutf8(stdout_data) as str;
+	let stderr = strings::fromutf8(stderr_data) as str;
+
+	return (stdout, stderr);
+};
+
+fn home_dir(args: *[]str, uid: u32) void = {
+	let user_dir = fmt::asprintf("/run/user/{}", uid);
+	let home_dir = fmt::asprintf("{}/home", user_dir);
+
+	append(args, "--dir");
+	append(args, home_dir);
+	append(args, "--setenv");
+	append(args, "HOME");
+	append(args, home_dir);
+	append(args, "--setenv");
+	append(args, "XDG_RUNTIME_DIR");
+	append(args, user_dir);
+};
+
+fn shared_app_dir(args: *[]str) str = {
+	let tmp_app_dir = temp::dir();
+
+	append(args, "--bind");
+	append(args, tmp_app_dir);
+	append(args, "/app");
+	append(args, "--chdir");
+	append(args, "/app");
+
+	return tmp_app_dir;
+};
+
+fn command(args: *[]str, app_file: str) void = {
+	append(args, "/usr/bin/timeout");
+	let timeout = fmt::asprintf("{}", DEFAULT_TIMEOUT);
+	append(args, timeout);
+	append(args, HARE_COMMAND);
+	append(args, "run");
+	append(args, app_file);
+};
+
+fn getids() (uint, uint) = {
+	return (unix::getuid(), unix::getgid());
+};