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Route with renderToStream not working as expected #674

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Route with renderToStream not working as expected#674
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1.0Issues that must be fixed for the 1.0 releasebugSomething isn't working
@matiaskorhonen

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@matiaskorhonen
matiaskorhonen
opened on Sep 5, 2025

I'm trying to figure out how to get responses with a chunked transfer encoding using RedwoodSDK but I'm running into an error when I try to do so.

I have a very basic app with a “normal” route and a streamed route that I pretty much copied from the kitchen sink example:

import { defineApp, renderToStream } from "rwsdk/worker";
import { route, render } from "rwsdk/router";
import { Document } from "@/app/Document";
import { setCommonHeaders } from "@/app/headers";
import { setupSessionStore } from "./session/store";
import { Session } from "./session/durableObject";
import { env } from "cloudflare:workers";
export { SessionDurableObject } from "./session/durableObject";

export type AppContext = {
  session: Session | null;
};

export default defineApp([
  setCommonHeaders(),
  async () => {
    setupSessionStore(env);
  },
  render(Document, [route("/", () => <h1>Not streamed</h1>)]),
  route("/stream", async () => {
    const stream = await renderToStream(
      <div>
        <h1>Streamed route</h1>
        <p>This should be a chunked response</p>
      </div>,
      { Document }
    );
    return new Response(stream, {
      status: 200,
      headers: { "Content-Type": "text/html" },
    });
  }),
]);

When I load the stream route in the browser, the contents briefly flash but then vanish and there's a ‘Connection closed’ error in the browser console:

Error.-.Connection.Closed.mov

I get the same behaviour locally and on Cloudflare workers.

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