diff --git a/client/javascript/http.js b/client/javascript/http.js
index b459613..68db92d 100644
--- a/client/javascript/http.js
+++ b/client/javascript/http.js
@@ -149,6 +149,9 @@ class HTTPSession extends CurlSession {
 
   static async create_options(params) {
     let body = null;
+    if (params.body instanceof ReadableStream) {
+      params.duplex = "half";
+    }
     let request_obj = new Request("http://127.0.0.1/", params);
     let array_buffer = await request_obj.arrayBuffer();
     if (array_buffer.byteLength > 0) {