Debug statements

proxy.py

@@ -46,11 +46,13 @@ def chooser():
         <title>Netron</title>
         <script type="text/javascript">
             function setFileBefore() {
+                console.log('setFileBefore');
                 var url = document.getElementById('urlbefore').value;
                 var iframe = document.getElementById('netronbefore');
                 iframe.src = '/netron?url=' + url;
             }
             function setFileAfter() {
+                console.log('setFileAfter');
                 var url = document.getElementById('urlafter').value;
                 var iframe = document.getElementById('netronafter');
                 iframe.src = '/netron?url=' + url;