Streaming errors with 'No body in response'

[ninjz]

I've been trying to follow the examples to get this working, but not having any luck. I'm able to get the final response from the useStream hook but all the intermediate streaming steps are resulting in errors.

I'm also getting these error which I assume are from the useStream hook (I'm on iOS RN Expo btw):

No body in response {"_bodyBlob": {"_data": {"__collector": [Object], "blobId": "CF7E4A38-9E84-438F-BB41-73C149CE58BC", "name": "stream-journal-response.txt", "offset": 0, "size": 325, "type": "text/plain"}}, "_bodyInit": {"_data": {"__collector": [Object], "blobId": "CF7E4A38-9E84-438F-BB41-73C149CE58BC", "name": "stream-response.txt", "offset": 0, "size": 325, "type": "text/plain"}}, "bodyUsed": false, "headers": {"map": {"access-control-allow-origin": "*", "content-type": "text/plain; charset=utf-8", "date": "Fri, 26 Sep 2025 16:46:57 GMT", "vary": "Origin", "via": "1.1 Caddy", "x-convex-usher": "1"}}, "ok": true, "status": 200, "statusText": "", "type": "default", "url": "https://xxx.convex.site/stream-response"}

Appreciate any help on this as we desperately want persistent text streaming working for our app. Thank you

[sincerely-manny]

+1

[ninjz]

@sincerely-manny I've decided not to use this anymore since I'm using gemini models where the Time To First Token is really long which makes this pointless. But I did figure out how to get this working on React Native.

You'll need to modify node_modules/@convex-dev/persistent-text-streaming/dist/commonjs/react/index.js and replace fetch with fetch from expo-fetch and modify the url passed in to string as it does not take URL as an argument anymore.

Here is the full patch:

diff --git a/node_modules/@convex-dev/persistent-text-streaming/dist/commonjs/react/index.js b/node_modules/@convex-dev/persistent-text-streaming/dist/commonjs/react/index.js
index f999fcd..fa37d51 100644
--- a/node_modules/@convex-dev/persistent-text-streaming/dist/commonjs/react/index.js
+++ b/node_modules/@convex-dev/persistent-text-streaming/dist/commonjs/react/index.js
@@ -1,6 +1,7 @@
 "use client";
 import { useQuery } from "convex/react";
 import { useEffect, useMemo, useRef, useState } from "react";
+import { fetch as expoFetch } from "expo/fetch";
 if (typeof window === "undefined") {
     throw new Error("this is frontend code, but it's running somewhere else!");
 }
@@ -97,7 +98,7 @@ export function useStream(getPersistentBody, streamUrl, driven, streamId, opts)
  * or finished, etc.
  */
 async function startStreaming(url, streamId, onUpdate, headers) {
-    const response = await fetch(url, {
+    const response = await expoFetch(url.toString(), {
         method: "POST",
         body: JSON.stringify({
             streamId: streamId,

You should also make sure the header from your HTTP action is set to 'Content-Type': 'application/octet-stream'

Hope this helps

[sincerely-manny]

Oh! Thank you so much. Appreciate it!❤️

[sincerely-manny]

yep, that works! Thanks again @ninjz

@convex-dev__persistent-text-streaming.patch