    def get_proxied_http_client(self) -> SimpleHttpClient:
        """
        An HTTP client that uses configured HTTP(S) proxies.
        """
        return SimpleHttpClient(
            self,
            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.