NuGet.ProxyCache.GetProxy C# (CSharp) Method

        public IWebProxy GetProxy(Uri uri)
        {
            // Check if the user has configured proxy details in settings or in the environment.
            WebProxy configuredProxy = GetUserConfiguredProxy();
            if (configuredProxy != null)
            {
                // If a proxy was cached, it means the stored credentials are incorrect. Use the cached one in this case.
                WebProxy actualProxy;
                if (_cache.TryGetValue(configuredProxy.Address, out actualProxy))
                {
                    return actualProxy;
                }
                return configuredProxy;
            }

            if (!IsSystemProxySet(uri))
            {
                return null;
            }

            WebProxy systemProxy = GetSystemProxy(uri);

            WebProxy effectiveProxy;
            // See if we have a proxy instance cached for this proxy address
            if (_cache.TryGetValue(systemProxy.Address, out effectiveProxy))
            {
                return effectiveProxy;
            }

            return systemProxy;
        }