diff --git a/bin/tag-reader-dummy b/bin/tag-reader-dummy
index 9eaed9f..345e7d3 100755
--- a/bin/tag-reader-dummy
+++ b/bin/tag-reader-dummy
@@ -61,7 +61,7 @@ var html = `
       console.log(uid);
 
       var xhr = new XMLHttpRequest();
-      xhr.open('POST', 'http://localhost:8191/', true);
+      xhr.open('POST', 'http://' + document.location.host + '/', true);
       xhr.setRequestHeader('Content-Type', 'application\/x-www-form-urlencoded');
       xhr.send('uid=' + uid);
     };
@@ -91,5 +91,7 @@ app.post('/', function(req, res, next) {
 server.on('request', app);
 
 server.listen(8191, function () {
-  process.stderr.write('tag-reader-dummy listening at http://localhost:8191');
+  process.stderr.write('tag-reader-dummy listening at http://*:8191');
 })
+
+// vim:ft=javascript: