HTTP/3 issue affecting R2 custom domains

lowCloudflareAug 31, 2026 18:47

api

API Issue

Summary

The issue has been identified and a fix is being implemented.

Impact

minor

Timeline

Aug 31, 2026 18:47

[investigating] Some Firefox users may see delayed or failed asset loads on R2 custom domains due to an incorrect HTTP/3 advertisement. We are working on a fix.

via statuspage

+19h 59m

Sep 1, 2026 14:46

[identified] The issue has been identified and a fix is being implemented.

via statuspage

Lessons Learned

⚠Cloudflare has experienced 367 incidents in the past year. This frequency suggests systemic reliability challenges that may warrant additional monitoring.

📊Incidents related to api have occurred 955 times across all providers in the past year. This is one of the most common failure categories in cloud infrastructure.

💡This incident is categorized as: API Issue. Consider implementing preventive measures specific to this failure category.