A proxy is not necessarily a caching proxy. Often proxies are employed at firewalls or similar to enforce policies which sites can be visited and to filter traffic. In these cases use of a proxy is mandatory, i.e. there is no direct way to the internet.

In reply to Re^4: Inconsistent errors when trying to establish SSL-connection by noxxi
in thread Inconsistent errors when trying to establish SSL-connection by ddominnik

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