use lightweight MADIS health probe

tests/test_ops_health_check.py

@@ -0,0 +1,47 @@
+from web.services import ops_api
+
+
+class _Elapsed:
+    def total_seconds(self):
+        return 0.01
+
+
+class _Response:
+    ok = True
+    status_code = 200
+    elapsed = _Elapsed()
+
+
+def test_ops_health_check_uses_lightweight_head_for_madis(monkeypatch):
+    import requests
+
+    head_calls = []
+
+    monkeypatch.setattr(ops_api, "_require_ops", lambda request: {})
+    monkeypatch.setattr(ops_api, "_check_amsc_awos_health", lambda timeout=8: {"ok": True})
+    monkeypatch.setattr(requests, "get", lambda *args, **kwargs: _Response())
+    monkeypatch.setattr(
+        requests,
+        "head",
+        lambda url, **kwargs: head_calls.append((url, kwargs)) or _Response(),
+    )
+    for name in (
+        "SUPABASE_URL",
+        "SUPABASE_SERVICE_ROLE_KEY",
+        "KNMI_API_KEY",
+        "TELEGRAM_BOT_TOKEN",
+        "CWA_API_KEY",
+        "CWA_OPEN_DATA_AUTH",
+        "CWA_OPEN_DATA_API_KEY",
+    ):
+        monkeypatch.delenv(name, raising=False)
+
+    result = ops_api.get_ops_health_check(object())
+
+    assert result["services"]["madis"]["ok"] is True
+    assert head_calls == [
+        (
+            "https://madis-data.ncep.noaa.gov/madisPublic1/data/LDAD/hfmetar/netCDF/",
+            {"timeout": 8, "allow_redirects": True},
+        )
+    ]

web/services/ops_api.py

@@ -2082,9 +2082,10 @@ def get_ops_health_check(request: Request) -> dict[str, Any]:
     # MADIS (NOAA)
     try:
         t0 = _time.perf_counter()
-        r = _r.get(
+        r = _r.head(
             "https://madis-data.ncep.noaa.gov/madisPublic1/data/LDAD/hfmetar/netCDF/",
             timeout=timeout,
+            allow_redirects=True,
         )
         results["madis"] = {
             "ok": r.ok,