One function

_relay_host in leeguooooo/claude-code-usage-bar

The author described this change as “fix(fp): loopback relays are not fingerprintable endpoints (#44)”. It counts as a record because the check below fails on the code as it stood at 5b7165850 and passes on ab6a6c43f, with nothing else changed between the two runs.

Projectleeguooooo/claude-code-usage-bar

Fix saved2026-08-02

Sharing licenceMIT · LICENSE

Change size+7 −3

What the code was meant to do, written into the code itself as a docstring

The relay host when ANTHROPIC_BASE_URL points off the official API, else None (official / unset). Same host-parsing as no-quota detection.

The change

1	1		def _relay_host(env: Dict[str, str]) -> Optional[str]:
2		-	"""The relay host when ANTHROPIC_BASE_URL points off the official API,
3		-	else None (official / unset). Same host-parsing as no-quota detection."""
	2	+	"""Remote relay host, or None for official, loopback, or unset URLs."""
4	3		base = (env.get("ANTHROPIC_BASE_URL") or "").strip()
5	4		if not base:
6	5		return None
7	6		from urllib.parse import urlparse
8	7		parsed = urlparse(base if "//" in base else "//" + base)
9	8		host = (parsed.hostname or "").strip().rstrip(".").lower()
10		-	if not host or host == _OFFICIAL_API_HOST:
	9	+	if not host or host == _OFFICIAL_API_HOST or host == "localhost":
11	10		return None
	11	+	try:
	12	+	if ip_address(host).is_loopback:
	13	+	return None
	14	+	except ValueError:
	15	+	pass
12	16		return host

The check that tells the two apart

fail→pass·tests/test_fp_risk.py::test_loopback_base_url_is_silent[HTTP://LOCALHOST:8787]

Check file tests/test_fp_risk.py, taken without changes from the fix and copied onto the older code, so the exact same check runs against both versions.

Origin and history

The fixab6a6c43fdf88293f8e9f700578bda5d54689c3e

The code before it5b71658501c378a35dec3c917b18bb2e070a1069

Broken version dated2026-08-02

Moduleclaude_statusbar.fp_risk

Units changed_relay_host

Fingerprint77fd9b2f2c060ce7

Checked2026-08-18 by goldset/0.1

Every field above is generated by our program. None of it is written by hand.

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