    def get_proxied_blacklisted_http_client(self) -> SimpleHttpClient:
        """
        An HTTP client that uses configured HTTP(S) proxies and blacklists IPs
        based on the IP range blacklist.
        """
        return SimpleHttpClient(
            self,
            ip_blacklist=self.config.ip_range_blacklist,
            http_proxy=os.getenvb(b"http_proxy"),
            https_proxy=os.getenvb(b"HTTPS_PROXY"),
        )
A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks.