uvicorn Issue getting root path from scope for access log

The Fix

Upgrade to version 0.11.4 or later.

Based on closed Kludex/uvicorn issue #304 · 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

@@ -436,7 +436,7 @@ async def send(self, message):
                     self.scope["client"],
                     self.scope["method"],
-                    self.scope["root_path"] + self.scope["path"],
+                    self.scope.get("root_path", "") + self.scope["path"],
                     self.scope["http_version"],

fix.md

Option A — Upgrade to fixed release\nUpgrade to version 0.11.4 or later.\nWhen NOT to use: Do not use this fix if the application relies on a non-empty root path for logging.\n\n

Why This Fix Works in Production

Trigger: Based on changes from pr #284 for issue #253 the access log now is trying to get the root path from the scope and it doesn't have to be present.
Mechanism: The access log attempts to retrieve the root path from the scope, which may not be present
Why the fix works: Fixes issue #304 by ensuring that an empty string is used for the root path if it is not present in the scope. (first fixed release: 0.11.4).

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

The access log attempts to retrieve the root path from the scope, which may not be present
Production symptom (often without a traceback): Based on changes from pr #284 for issue #253 the access log now is trying to get the root path from the scope and it doesn't have to be present.

Proof / Evidence

GitHub issue: #304
Fix PR: https://github.com/kludex/uvicorn/pull/305
First fixed release: 0.11.4
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.70

Discussion

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

Jump to Sources Open on GitHub

“Based on changes from pr #284 for issue #253 the access log now is trying to get the root path from the scope and it doesn't have to be present.”

Issue thread · issue description · source

Failure Signature (Search String)

Based on changes from pr #284 for issue #253 the access log now is trying to get the root path from the scope and it doesn't have to be present.

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Based on changes from pr #284 for issue #253  the access log now is trying to get the root path from the scope and it doesn't have to be present.

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Based on changes from pr #284 for issue #253  the access log now is trying to get the root path from the scope and it doesn't have to be present.

What Broke

Access logs may fail to log the correct path, leading to incomplete log entries.

Why It Broke

The access log attempts to retrieve the root path from the scope, which may not be present

Fix Options (Details)

Option A — Upgrade to fixed release Safe default (recommended)

Upgrade to version 0.11.4 or later.

When NOT to use: Do not use this fix if the application relies on a non-empty root path for logging.

Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.

Fix reference: https://github.com/kludex/uvicorn/pull/305

First fixed release: 0.11.4

Last verified: 2026-02-09. Validate in your environment.

When NOT to Use This Fix

Do not use this fix if the application relies on a non-empty root path for logging.

Did This Fix Work in Your Case?

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

Prevention

Capture the exact failing error string in logs and tests so you can reproduce via a minimal script.
Pin production dependencies and upgrade only with a reproducible test that hits the failing path.

Version Compatibility Table

Version	Status
0.11.4	Fixed

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.

uvicorn Issue getting root path from scope for access log (Fix)