fix: use plain HTTP client with claude-cli User-Agent for OAuth token exchange#52
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mirrorange merged 1 commit intomirrorange:mainfrom Mar 28, 2026
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… exchange Anthropic rejects requests to console.anthropic.com/v1/oauth/token that carry browser fingerprinting or non-matching User-Agent headers with 429. Use a plain httpx session with User-Agent matching Claude Code's format. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Problem
OAuth token exchange to
console.anthropic.com/v1/oauth/tokenreturns 429 because Anthropic now rejects requests carrying browser fingerprinting headers (TLS JA3, browser User-Agent) or non-matching User-Agent values.The current
exchange_token()andrefresh_access_token()use_request()which creates a session withimpersonate="chrome", triggering the rejection.Changes
create_plain_session()inhttp_client.py— prefers httpx (no TLS fingerprinting), falls back to curl_cffi/rnet withimpersonate=None_token_request()inoauth.py— uses the plain session withContent-Type: application/x-www-form-urlencodedandUser-Agent: claude-cli/2.1.81 (external, cli)exchange_token()andrefresh_access_token()to use_token_request()What #51 was missing
PR #51 correctly identified the need for a plain HTTP session and
application/x-www-form-urlencodedcontent type, but usedUser-Agent: anthropicwhich Anthropic also blanket-rejects with 429. Per the opencode discussion, the token endpoint requires a User-Agent matching Claude Code's format (claude-cli/<version> (external, cli)).References