fix(claude-code): add missing anthropic-beta oauth header - #58
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ClaudeCodeProvider.prepareHeaders() sets Authorization: Bearer <token> for OAuth accounts but never sets anthropic-beta: oauth-2025-04-20. Anthropic accepts requests without it for some models (observed: claude-haiku-4-5) but rejects others (observed: claude-sonnet-5, claude-sonnet-4-5) with a misleading 401 "x-api-key header is required" — even though the account has a valid, unexpired OAuth token with the right entitlement (confirmed by calling the API directly with the same token, bypassing ccflare, which correctly returns a 429 for the same model instead of a 401). Merges into any anthropic-beta value already present on the request rather than overwriting it.
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Fixes #57
Problem
ClaudeCodeProvider.prepareHeaders()setsAuthorization: Bearer <token>for OAuth accounts but never setsanthropic-beta: oauth-2025-04-20. Anthropic silently accepts some models without it (observed:claude-haiku-4-5) but rejects others (observed:claude-sonnet-5,claude-sonnet-4-5) with a misleading401 x-api-key header is required— even with a valid, unexpired, correctly-entitled OAuth token.Confirmed the token itself is fine: calling
api.anthropic.comdirectly with the same token + the beta header (bypassing ccflare) authenticates correctly for all of the above models.The compat route (
/v1/ccflare/*) already sets this header via itsANTHROPIC_BETAconstant incompat/handler.ts; the native provider route (/v1/claude-code/*) — the one the README documents for pointing Anthropic SDKs directly at ccflare — did not.Fix
Add
anthropic-beta: oauth-2025-04-20when attaching the OAuth Bearer token inClaudeCodeProvider.prepareHeaders(), merging with any beta value already present on the incoming request rather than clobbering it.Test plan
claude-haiku-4-5via/v1/claude-code/v1/messagesstill returns 200 (no regression)claude-sonnet-5via the same route no longer 401s on the auth layer — first internal attempt is now correctly authenticated (verified with temporary debug logging showing the account is selected and a real request reaches Anthropic)api.anthropic.comwith the same token confirms matching behavior post-fixSee #57 for full repro details and the confusing secondary 401-via-502-retry symptom this can produce when only one account is configured.