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Alex Langenfeld df0103bc3c Document stream reader request cancellation (#3581)
## Summary & Motivation

The earlier timeout-docs attempt in #534 was closed without merging.
Without `supportsCancellation`, a browser disconnect leaves the stream
reader reconnecting until the function hits
`FUNCTION_INVOCATION_TIMEOUT`, so the streaming guide now documents the
`vercel.json` opt-in, with a warning that it terminates everything
matching the configured path, and the resumable-streams guide points at
it.

## Test Plan

Docs only; no tests.


## Docs Preview

| Page | v4 | v5 |
| --- | --- | --- |
| Streaming |
[Preview](https://workflow-docs-git-alangenfeld-timeout-docs.vercel.sh/docs/foundations/streaming#avoiding-function-timeouts-after-client-disconnects)
|
[Preview](https://workflow-docs-git-alangenfeld-timeout-docs.vercel.sh/v5/docs/foundations/streaming#avoiding-function-timeouts-after-client-disconnects)
|
| Resumable Streams |
[Preview](https://workflow-docs-git-alangenfeld-timeout-docs.vercel.sh/docs/ai/resumable-streams)
|
[Preview](https://workflow-docs-git-alangenfeld-timeout-docs.vercel.sh/v5/docs/ai/resumable-streams)
|

Signed-off-by: Alex Langenfeld <alex.langenfeld@vercel.com>
2026-08-17 13:04:11 -05:00
..