feat: retry on 503, add Retry-After date (RFC1123) support

[hhsnopek]

Description

This pull-request adds support RFC1123 when parsing the retry value from a Retry-After header. Additionally a 503 response from Clerk's APIs will now be retried, previously only 429s were supported.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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⚠️ No Changeset found

Latest commit: 63ee32b

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch henry/add-retry-after-date-support

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Project	Deployment	Preview	Comments	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Comment	Nov 25, 2025 4:33am