fix: forward vendor-specific headers through proxy#21
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Anthropic's API requires the `anthropic-version` header on all requests. The proxy was only forwarding common headers (content-type, accept, user-agent), causing all Anthropic model calls to fail with 400. Add `forwardHeaders` field to VendorConfig so each vendor can declare extra headers to forward. Anthropic gets `anthropic-version` and `anthropic-beta`; other vendors are unaffected. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
anthropic-versionheader on all requests — the proxy was stripping it, causing 400 errors for any Anthropic modelforwardHeadersfield toVendorConfigso each vendor declares its own extra headers to forwardanthropic-versionandanthropic-beta; all other vendors are unaffectedTest plan
anthropic-version: header is requirederrors)npm testinproxy/🤖 Generated with Claude Code