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fix(webapp): keep playground chat requests same-origin #4193

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Merged
isshaddad merged 2 commits into from
Jul 8, 2026
+11 −2
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fix(webapp): keep playground chat requests same-origin #4193

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fix(webapp): keep playground chat requests same-origin
isshaddad Jul 8, 2026
9ad4a73
Merge branch 'main' into fix/playground-chat-same-origin-base-url
isshaddad Jul 8, 2026
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7 changes: 7 additions & 0 deletions .server-changes/playground-chat-same-origin-base-url.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
---
area: webapp
type: fix
---

Fixed the agent playground chat failing to send messages ("Failed to fetch")
in some environments. Messages now reach the agent reliably.
6 changes: 4 additions & 2 deletions ...s.$organizationSlug.projects.$projectParam.env.$envParam.playground.$agentParam/route.tsx
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Expand Up @@ -251,8 +251,10 @@ function PlaygroundChat() {
return data.publicAccessToken;
}, [actionPath, agent.slug, chatId, tags, machine, maxAttempts, maxDuration, version, region]);

// Resource route prefix — all realtime traffic goes through session-authed routes
const playgroundBaseURL = `${apiOrigin}/resources/orgs/${organization.slug}/projects/${project.slug}/env/${environment.slug}/playground`;
// Same-origin resource routes: use the page origin, not apiOrigin, so in/append
// doesn't go cross-origin (CORS preflight) when API_ORIGIN != APP_ORIGIN.
const origin = typeof window !== "undefined" ? window.location.origin : apiOrigin;
const playgroundBaseURL = `${origin}/resources/orgs/${organization.slug}/projects/${project.slug}/env/${environment.slug}/playground`;

// The transport is constructed once (guarded ref below); reading
// `startSession` directly there would freeze its closure to the
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