Update conn.ts

Author: EdamAme-x

packages/linejs/base/push/conn.ts

@@ -113,6 +113,8 @@ export class Conn {
 			headers,
 			body: bodystream.stream,
 			signal: abort.signal,
+			// https://github.com/evex-dev/linejs/issues/109
+			duplex: "half"
 		});
 		if (!socket.body) {
 			throw new Error("no body");