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Result of scan with Bandit:

blacklist: Audit url open for permitted schemes. Allowing use of file:/ or custom schemes is often unexpected.
Test ID: B310
Severity: MEDIUM
Confidence: HIGH

For details on B310 see this page in the Bandit manual.

Checking the status of an URL requires using a construct like:

request = Request(url, headers=nocxheaders)
	            with urlopen(request, timeout=nocxtimeout) as response:
	                return url, response.status

Mitigation to your judgement:

• Content of URLs is not processed.
• Only the DNS or HTTP status of an URL is verified.
• Use of external libraries, like requests or aiohttp is deliberately avoided.