---
description: Cloudflare now handles and reports HTTP/3 client cancellations more consistently across all plans, improving visibility and reducing unnecessary origin work.
title: Improved HTTP/3 client cancellation reporting
image: https://developers.cloudflare.com/changelog/post/2026-10-09-http3-499-reporting-improvement/og.png?v=5ee459f01b9b0d99
---

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October 9, 2026

## Improved HTTP/3 client cancellation reporting

[Cloudflare Fundamentals](https://developers.cloudflare.com/fundamentals/)

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Cloudflare has improved how it handles and reports client-cancelled HTTP/3 requests across Free, Pro, Business, and Enterprise plans. Customers now get a clearer view of client behavior in Cloudflare analytics and, where available, logs.

Previously, Cloudflare did not always stop an HTTP/3 request when the client cancelled its request stream. Some cancellations were already recorded as `499`, while others continued to the origin and showed the eventual upstream status.

Cloudflare now stops affected requests sooner, reducing unnecessary origin work, and records them as `499`. Customers may notice more `499` status codes for HTTP/3 traffic. This reflects more consistent reporting of existing cancellations, not an increase in failed requests.

Customers who use `499` status codes in availability calculations should consider excluding them from server-side error rates because they represent requests cancelled by clients.

For more information, refer to [Error 499](https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-499/).

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