Simpler servername

src/agent.ts

@@ -167,13 +167,10 @@ export default class SocksProxyAgent extends Agent {
 		debug('Successfully created socks proxy connection');
 
 		if (opts.secureEndpoint) {
-			const servername = opts.servername || opts.host;
-			if (!servername) {
-				throw new Error('Could not determine "servername"');
-			}
 			// The proxy is connecting to a TLS server, so upgrade
 			// this socket connection to a TLS connection.
 			debug('Upgrading socket connection to TLS');
+			const servername = opts.servername || host;
 			return tls.connect({
 				...omit(opts, 'host', 'hostname', 'path', 'port'),
 				socket,