Deal with request errors about sirup

[f-hafner]

Where does the error come from?

• from the API for the IP address
• from a DNS resolution failure (but requests should catch the DNS failures since version 2, see below)
• from another problem in requests.

Here are some more links.

• https://stackoverflow.com/questions/40145631/precisely-catch-dns-error-with-python-requests
• https://stackoverflow.com/questions/69323728/max-retries-exceeded-with-url-caused-by-newconnectionerror-failed-to-establish-a
• https://stackoverflow.com/questions/63242371/socket-gaierror-errno-3-temporary-failure-in-name-resolution
• psf/requests#3630
• psf/requests#3677
• https://stackoverflow.com/questions/23013220/max-retries-exceeded-with-url-in-requests
• https://stackoverflow.com/questions/33765360/urllib3-exceptions-newconnectionerror-error-handled-on-one-machine-but-not-on-an