remove trailing slashes and trim whitespaces

fixes #235

Author: raffis

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Logger should be able to serialize BigInt #229
 * Do not use format.json() in logger #228
 * Send feedback to new api endpoint #217
+* Trailing slash in server url leads to error #235
 
 ### Changes
 * Upgrade to electron v7 #132

app/ui/startup/browser.js

@@ -112,7 +112,7 @@ function verifyServer() {
   var $blnUrlField = $('#blnUrl');
   var $blnUrlInvalidMessage = $('#blnUrl-error-invalid');
   var $blnUrlNotreachableMessage = $('#blnUrl-error-notreachable');
-  var blnUrl = $blnUrlField.val();
+  var blnUrl = $blnUrlField.val().replace(/\/+$/, '').trim();
   $blnUrlInvalidMessage.hide();
   $blnUrlNotreachableMessage.hide();