Outage in Clever Cloud
🔄 HTTP/2 Backend Support — Rolling Out to cleverapps.io Load Balancers
Minor
March 12, 2026 - Started about 1 month ago
Official incident page
Official incident page
Incident Report
We are progressively deploying a mature branch of Sōzu with HTTP/2 (h2) backend support on cleverapps.io load balancers for battle-testing purposes.
This rollout is based on the work tracked in sozu-proxy/sozu#1209.
What this means for you: Your applications served through cleverapps.io load balancers may now negotiate HTTP/2 with backends. This should be transparent, but as with any infrastructure change at this stage, edge cases may arise.
If you encounter any issues, please contact our support team and include:
Relevant error logs from your application
A curl command that reproduces the problem (e.g. curl -vso /dev/null https://your-app.cleverapps.io/path)
This helps us diagnose and fix issues quickly.
Thank you for helping us battle-test this feature!
This rollout is based on the work tracked in sozu-proxy/sozu#1209.
What this means for you: Your applications served through cleverapps.io load balancers may now negotiate HTTP/2 with backends. This should be transparent, but as with any infrastructure change at this stage, edge cases may arise.
If you encounter any issues, please contact our support team and include:
Relevant error logs from your application
A curl command that reproduces the problem (e.g. curl -vso /dev/null https://your-app.cleverapps.io/path)
This helps us diagnose and fix issues quickly.
Thank you for helping us battle-test this feature!
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Latest Updates ( sorted recent to last )
OK
about 8 hours ago - at 04/24/2026 12:31PM
Some customers report us issues with h2 priority in Chrome and webkit browsers, which slow down the request or create timeouts, we are currently investigating the issue.
MAJOR
about 23 hours ago - at 04/23/2026 09:00PM
We have found and fix the issue which was related to h2 stream priority on single stream connection, see PR #1209 for more details on Sozu GitHub repository
OK
1 day ago - at 04/23/2026 05:06PM
Customers have reported us that on webkit browser, the h2 implementation is not working properly as there are random request timeout, but works fine in h1 and on Firefox. We are investigating the issue.
MAJOR
7 days ago - at 04/17/2026 12:21PM
We have updated our load balancers with a newer versions that fix a few bugs and fix CVEs as well.
We are watching the deployment status. However everything is green.
MAJOR
8 days ago - at 04/16/2026 09:10AM
We have updated our load balancers with a newer versions that fix a few bugs and fix CVEs as well.
We are watching the deployment status. However everything is green.
MAJOR
about 1 month ago - at 03/18/2026 12:09PM
The bug fix for truncated payload hit cleverapps load balancers, and seems to solve issues reported to us.
If you have still the issue please contact us with a curl or har archive.
MAJOR
about 1 month ago - at 03/18/2026 11:04AM
We have identified a bug that appears with payload >4MB (often javascript files) that are truncated randomly, we are investigating the issue
MAJOR
about 1 month ago - at 03/16/2026 07:17PM
The fix for close-delimited response with huge payload getting cut is in production.
MAJOR
about 1 month ago - at 03/16/2026 06:16PM
We have identified an issue with large payload and http1.1 close-delimited response. We are deploying a fix.
MAJOR
about 1 month ago - at 03/16/2026 03:57PM
Cookie issue seems to be solved, Sozu is still running in h2 for testing purposes. We will cut it only if there is a blocking issue or impacting.
MAJOR
about 1 month ago - at 03/16/2026 03:12PM
We pushed a new version of sozu with h2 and fixes for cookie header.
MAJOR
about 1 month ago - at 03/16/2026 02:51PM
There is another issue with cookie where sozu use , instead of ; to aggregate them. A fix is coming
MAJOR
about 1 month ago - at 03/16/2026 02:44PM
We found an issue with cookies where a request with multiple cookie header has only the first header passed to the backend, and same from backend to client.
MAJOR
about 1 month ago - at 03/16/2026 12:34PM
Monitoring and telemetry agree on well behavior of the h2 implementation, we will let it run in production a little longer.
MAJOR
about 1 month ago - at 03/16/2026 12:16PM
We have pushed a new versions with fixes about previous timeouts and h2, if you have issues, please report it through our support with a curl information and as much logs as possible.
Thanks you a lot for helping us provide to Sōzu a battle tested h2 implementation.
MAJOR
about 1 month ago - at 03/12/2026 11:27AM
The monitoring observe timeouts, we will make a patch and continue testing later
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