Amp\Artax\HttpSocketPool::autoDetectProxySettings PHP Method

    private function autoDetectProxySettings()
    {
        // See CVE-2016-5385, due to (emulation of) header copying with PHP web SAPIs into HTTP_* variables, HTTP_PROXY can be set by an user to any value he wants by setting the Proxy header
        // Mitigate the vulnerability by only allowing CLI SAPIs to use HTTP(S)_PROXY environment variable
        if (PHP_SAPI != "cli" && PHP_SAPI != "phpdbg" && PHP_SAPI != "embed") {
            return;
        }
        if (($httpProxy = getenv('http_proxy')) || ($httpProxy = getenv('HTTP_PROXY'))) {
            $this->options[self::OP_PROXY_HTTP] = $this->getUriAuthority($httpProxy);
        }
        if (($httpsProxy = getenv('https_proxy')) || ($httpsProxy = getenv('HTTPS_PROXY'))) {
            $this->options[self::OP_PROXY_HTTPS] = $this->getUriAuthority($httpsProxy);
        }
    }