fix(vercel-sandbox): disable headers timeout on default agent#172
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umairnadeem wants to merge 1 commit intovercel:mainfrom
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fix(vercel-sandbox): disable headers timeout on default agent#172umairnadeem wants to merge 1 commit intovercel:mainfrom
umairnadeem wants to merge 1 commit intovercel:mainfrom
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`DEFAULT_AGENT` already disables `bodyTimeout` to support long-running streams, but undici's `headersTimeout` was left at its 5-min default. That cuts off `cmd.wait()`'s long-poll request when a sandbox command runs longer than 5 minutes, even when the sandbox itself has a longer timeout. Set `headersTimeout: 0` to match the existing intent. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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May 1, 2026
`@vercel/sandbox`'s default undici Agent disables `bodyTimeout` but leaves `headersTimeout` at undici's 5-min default, causing `cmd.wait()`'s long-poll to abort after 5 min even when the sandbox itself has a longer timeout. That was capping `createSandbox`'s `timeoutInMilliseconds: 15 * 60 * 1000` at 5 min and breaking long `pnpm install` steps inside `create-snapshot.ts`. Patches both the ESM and CJS dist files via patch-package. Reapplied on postinstall, including in the Vercel build container. Locked to the version in package-lock.json (1.10.0); patch will be removed once vercel/sandbox#172 ships in a release. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
QuiiBz
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May 6, 2026
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Problem
DEFAULT_AGENTinbase-client.tsdisablesbodyTimeoutbut leaves undici'sheadersTimeoutat its 5-min default:That breaks
cmd.wait(). It issues a single GET to/v1/sandboxes/{id}/cmd/{cmdId}?wait=true— the API holds the connection open and only sends response headers once the command finishes. If the underlying command takes longer than 5 min, undici aborts the request before headers arrive and throwsTimeoutError(code: 23), even though the sandbox itself is still happily running.Repro
Hit this via
@remotion/vercel'screateSandbox. SetSandbox.create({ timeout: 15 * 60 * 1000 }). Sandbox lived its full 15 min per the Vercel dashboard. Script died at exactly 5 min withTimeoutError: The operation timed out.mid-pnpm install. So thetimeoutoption is effectively capped at 5 min for any command (cold pnpm install, browser download, etc.) that runs longer.Fix
Also set
headersTimeout: 0onDEFAULT_AGENT. Matches the existing intent — the comment onbodyTimeout: 0says "disable body timeout to allow long logs streaming", and the long-poll endpoint is just as much a long-running pattern as streaming logs.No public API change.