libcurl with CURLAUTH_ANY answers a 401/407 by resending the request with
an Authorization header. Two spots in net/ cut that short:
- http_client's header callback delivered the response head exactly once
and latched `head_delivered`, so after an auth challenge the caller only
ever saw the 401 — never the 2xx of the authenticated resend. Reset the
latch when a fresh status line follows a delivered 401/407 (redirects
never reach that path — their head is suppressed).
- the prober's head callbacks return DataAction::abort to skip the body,
which also aborts the transfer mid-handshake. Return `proceed` for a
401/407 when credentials were supplied, so curl's resend can run; the
real status lands on the next header block.
Also give ProbeRequest an `auth` field (default scheme == none) and pass
it through base_request(), so a re-probe after a 401 can present the
credentials the user just entered. No behaviour change when no auth is
configured.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01HPPSGhiArbvQgwC2DNiURS
samiandClaude Sonnet 5
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