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Last updated: April 29, 2026
Why this module. Old API versions are where security debt accumulates. v1 was insecure by 2019 standards; it’s still serving 5% of traffic in 2026 because retiring it requires customer coordination. Most teams underestimate the security cost of supporting old versions.
Why this module. Old API versions are where security debt accumulates. v1 was insecure by 2019 standards; it’s still serving 5% of traffic in 2026 because retiring it requires customer coordination. Most teams underestimate the security cost of supporting old versions.
Versioning patterns
- URL versioning —
/v1/usersvs/v2/users. Visible, easy to route. Most common. - Header versioning —
API-Version: 2. Cleaner URLs; harder to debug. - Subdomain —
v1.api.example.com. DNS-driven; allows independent infrastructure.
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