import urllib.request, ssl

ctx = ssl._create_unverified_context()
for path in ['/topology.png', '/topology.html']:
    url = 'https://homepage.snarfnet.net' + path
    try:
        req = urllib.request.Request(url, headers={'User-Agent': 'Mozilla/5.0'})
        with urllib.request.urlopen(req, context=ctx, timeout=10) as r:
            data = r.read()
            print(f'{url} -> HTTP {r.status}, length: {len(data)} bytes, Content-Type: {r.headers.get("Content-Type")}')
    except Exception as e:
        print(f'{url} -> Error: {e}')