fail early on invalid http

snapshotter/src/snapshot.py

@@ -29,6 +29,8 @@ def today(today=dt.today()):
 
 def download(url, target, **kwargs):
 	response = requests.get(url, stream=True, **kwargs)
+	if not response.ok:
+		raise ValueError("HTTP not OK", response.status_code, response.text)
 	response.raw.decode_content = True
 	with open(target, "wb") as out:
 		shutil.copyfileobj(response.raw, out)