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400 bad request: Authorization header is badly formatted - GHE #38575

Description

@jaroslawgajewski

Problem

Since the gh-aw v0.79.3 upgrade, every agentic workflow on GHE instance runs AWF v0.27.0, whose api-proxy sends a malformed Authorization header to the GHES Copilot endpoint. Execute GitHub Copilot CLI dies after 4 retries with:

400 bad request: Authorization header is badly formatted

Related gh-aw-firewall issue:

github/gh-aw-firewall#4744

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