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23b81ab243
Custom Claude proxies fronted by Cloudflare with Browser Integrity Check
enabled (e.g. `packyapi.com`) reject requests with the default
`Python-urllib/*` signature, returning HTTP 403 "error code: 1010".
`probe_api_models` swallowed that in its blanket `except Exception:
continue`, so `validate_requested_model` returned the misleading
"Could not reach the <provider> API to validate `<model>`" error even
though the endpoint is reachable and lists the requested model.
Advertise the probe request as `hermes-cli/<version>` so Cloudflare
treats it as a first-party client. This mirrors the pattern already used
by `agent/gemini_native_adapter.py` and `agent/anthropic_adapter.py`,
which set a descriptive UA for the same reason.
Reproduction (pre-fix):
python3 -c "
import urllib.request
req = urllib.request.Request(
'https://www.packyapi.com/v1/models',
headers={'Authorization': 'Bearer sk-...'})
urllib.request.urlopen(req).read()
"
urllib.error.HTTPError: HTTP Error 403: Forbidden
(body: b'error code: 1010')
Any non-urllib UA (Mozilla, curl, reqwest) returns 200 with the
OpenAI-compatible models listing.
Tested on macOS (Python 3.11). No cross-platform concerns — the change
is a single header addition to an existing `urllib.request.Request`.