web-fetch not working in corporate environment

Our company is using ZScaler to intercept and check webtraffic. In general publicly available AI tools are blocked to prevent leaking internal and customer data into the public. The domain claude.ai is also blocked. This however also blocks requests from claude-code to an endpoint that is obviously used to check domains for being safe before actually fetching web content:

Error: Unable to verify if domain github.com is safe to fetch. This may be due to network restrictions or enterprise security policies blocking claude.ai.

I couldn't find any information about which endpoint this is to be able to ask for an exception. Currently, claude-code is not able to do any web-research which is a huge drawback! Can you point me to any piece of code or documentation that I could forward to the responsible people internally?

Thanks,
micxer