urllib3 [v2] Remove deprecated Retry options (Fix)

The Fix

pip install urllib3==1.26.3

Based on closed urllib3/urllib3 issue #2058 · 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

@@ -2,7 +2,6 @@
 import re
 import time
-import warnings
 from collections import namedtuple
 from itertools import takewhile

fix.md

Option A — Upgrade to fixed release\npip install urllib3==1.26.3\nWhen NOT to use: This fix should not be used if the application relies on deprecated Retry options for functionality.\n\n

Why This Fix Works in Production

Trigger: Users may encounter unexpected behavior due to deprecated options still being available.
Mechanism: Deprecated Retry options were still present in the codebase despite being removed in a previous pull request
Why the fix works: Removes deprecated Retry options as requested in issue #2058. (first fixed release: 1.26.3).

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

Deprecated Retry options were still present in the codebase despite being removed in a previous pull request
Production symptom (often without a traceback): Users may encounter unexpected behavior due to deprecated options still being available.

Proof / Evidence

GitHub issue: #2058
Fix PR: https://github.com/urllib3/urllib3/pull/2086
First fixed release: 1.26.3
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.83

Discussion

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

Jump to Sources Open on GitHub

“Remove the options deprecated in https://github.com/urllib3/urllib3/pull/2000”

Issue thread · issue description · source

Failure Signature (Search String)

Users may encounter unexpected behavior due to deprecated options still being available.

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Users may encounter unexpected behavior due to deprecated options still being available.

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Users may encounter unexpected behavior due to deprecated options still being available.

What Broke

Users may encounter unexpected behavior due to deprecated options still being available.

Why It Broke

Deprecated Retry options were still present in the codebase despite being removed in a previous pull request

Fix Options (Details)

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

pip install urllib3==1.26.3

When NOT to use: This fix should not be used if the application relies on deprecated Retry options for functionality.

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

Fix reference: https://github.com/urllib3/urllib3/pull/2086

First fixed release: 1.26.3

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

When NOT to Use This Fix

This fix should not be used if the application relies on deprecated Retry options for functionality.

Did This Fix Work in Your Case?

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

Prevention

Add a CI check that diffs key outputs after upgrades (OpenAPI schema snapshots, JSON payload shapes, CLI output).
Upgrade behind a canary and run integration tests against the canary before 100% rollout.

Version Compatibility Table

Version	Status
1.26.3	Fixed

Related Issues

No related fixes found.

Cluster: urllib3:configuration-error urllib3 hub urllib3 best practices All hubs All clusters

Related clusters: Data consistency SSL handshake Other

Sources

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