uvicorn SSL tests verification (Fix)

The Fix

Introduces SSL verification in the tests, addressing the issue of not verifying SSL connections.

Based on closed Kludex/uvicorn issue #927 · PR/commit linked

Production note: Most teams hit this during upgrades or environment changes. Roll out with a canary and smoke critical endpoints (health, OpenAPI/docs) before 100%.

Open PR/Commit

@@ -1,3 +1,5 @@
@@ -1,3 +1,5 @@
+import ssl
+
 import pytest

fix.md

Option A — Apply the official fix\nIntroduces SSL verification in the tests, addressing the issue of not verifying SSL connections.\nWhen NOT to use: Do not use this fix if SSL verification is not required for your application.\n\n

Why This Fix Works in Production

Trigger: SSL tests verification
Mechanism: SSL tests did not verify SSL connections, leading to potential security vulnerabilities

Production impact:

If left unfixed, the same config can fail only in production (env differences), causing startup failures or partial feature outages.

Why This Breaks in Prod

SSL tests did not verify SSL connections, leading to potential security vulnerabilities
Production symptom (often without a traceback): SSL tests verification

Proof / Evidence

GitHub issue: #927
Fix PR: https://github.com/kludex/uvicorn/pull/928
Reproduced locally: No (not executed)
Last verified: 2026-02-12
Confidence: 0.60
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.88

Discussion

High-signal excerpts from the issue thread (symptoms, repros, edge-cases).

Jump to Sources Open on GitHub

“Our ssl tests currently dont verify anything :) Note for the future: maybe Requests didn't support it, but now with HTTPX I think we could pass verify=<ca_cert>, rather than disabling SSL verification. _Originally posted by @florimondmanca”

Issue thread · issue description · source

Failure Signature (Search String)

SSL tests verification
Our ssl tests currently dont verify anything :)

Copy-friendly signature

signature.txt

Failure Signature
-----------------
SSL tests verification
Our ssl tests currently dont verify anything :)

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
SSL tests verification
Our ssl tests currently dont verify anything :)

What Broke

SSL verification failures could lead to insecure connections in production.

Why It Broke

SSL tests did not verify SSL connections, leading to potential security vulnerabilities

Fix Options (Details)

Option A — Apply the official fix

Introduces SSL verification in the tests, addressing the issue of not verifying SSL connections.

When NOT to use: Do not use this fix if SSL verification is not required for your application.

Fix reference: https://github.com/kludex/uvicorn/pull/928

Last verified: 2026-02-12. Validate in your environment.

When NOT to Use This Fix

Do not use this fix if SSL verification is not required for your application.

Did This Fix Work in Your Case?

Quick signal helps us prioritize which fixes to verify and improve.

Prevention

Add a TLS smoke test that performs a real handshake in CI (include CA bundle validation and hostname checks).
Alert on handshake failures by error string and endpoint to catch cert/CA changes quickly.

Related Issues

No related fixes found.

Cluster: uvicorn:configuration-error All hubs All clusters

Related clusters: Data consistency Race condition SSL handshake

Sources

We don’t republish the full GitHub discussion text. Use the links above for context.