diff --git a/net/http/client.ha b/net/http/client.ha
index bf2a4bd..4eac8ab 100644
--- a/net/http/client.ha
+++ b/net/http/client.ha
@@ -48,6 +48,7 @@ fn new_request(client: *client, method: str, target: *uri::uri) request = {
 		method = method,
 		target = alloc(uri::dup(target)),
 		header = header_dup(&client.default_header),
+		transport = null,
 		body = void,
 	};
 	if (req.target.port == 0) {
diff --git a/net/http/do.ha b/net/http/do.ha
index 7720dcc..1d68da7 100644
--- a/net/http/do.ha
+++ b/net/http/do.ha
@@ -33,6 +33,18 @@ export fn do(client: *client, req: *request) (response | error) = {
 	fmt::fprintf(&file, "\r\n")?;
 	bufio::flush(&file)?;
 
+	const trans = match (req.transport) {
+	case let t: *transport =>
+		yield t;
+	case =>
+		yield &client.default_transport;
+	};
+	// TODO: Implement None
+	assert(trans.request_transport == transport_mode::AUTO);
+	assert(trans.response_transport == transport_mode::AUTO);
+	assert(trans.request_content == content_mode::AUTO);
+	assert(trans.response_content == content_mode::AUTO);
+
 	match (req.body) {
 	case let body: io::handle =>
 		io::copy(conn, body)?;