Some fine tuning

static/app.js

@@ -20,7 +20,7 @@ function api( method, url, data ){
         return response.json();
       }
       return response.json().then( v =>{
-        throw v;
+        alert( v.error );
       });
     });
 }
@@ -45,9 +45,6 @@ var app = new Vue({
         .then( res =>{
           this.ips = res.ips;
         })
-        .catch( res =>{
-          alert( res.error )
-        });
     }
   }
 });

static/index.html

@@ -10,7 +10,7 @@
       * List of public IPv6 IP assigned to the currently running server is shown below.
       * We can click on each link and verify whether that IP is globally accessible or not by visiting the link
       * Optionally, we can add new public IPv6 address using the form displayed in the bottom.
-      * Newly added IP will only persist for one minute. It will be removed after that.
+      * Newly added IP will only persist for five minute. It will be removed after that.
       * Please note that, we are only allowed change last 64 bits of existing global ip. Otherwise it won't work
     </pre>
     <div id="app">