Fix page if incorrect formatted url

views/index.eta

@@ -58,11 +58,30 @@
   <p>
     You have reached the end of the IPv4 Internet.
 
-    <% if (it.back_to_url) { %>
+    <% if (it.back_to_url) { 
+        let normalizedUrl = it.back_to_url;
+        let displayDomain = it.domain;
+        
+        try {
+            if (it.back_to_url) {
+                // Normalize URL by adding protocol if missing
+                if (!it.back_to_url.startsWith('http')) {
+                    normalizedUrl = `http://${it.back_to_url}`;
+                }
+                
+                const url = new URL(normalizedUrl);
+                displayDomain = url.hostname;
+            }
+        } catch (e) {
+            // Fall back to original values if parsing fails
+            normalizedUrl = it.back_to_url;
+            displayDomain = it.domain || it.back_to_url;
+        }
+    %>
     <p>
-        The site <%= it.domain %> is not reachable by IPv4.
+        The site <%= displayDomain %> is not reachable by IPv4.
         To access
-        <a href="<%= it.back_to_url %>" target="_blank"><%= it.domain %></a>,
+        <a href="<%= normalizedUrl %>" target="_blank"><%= displayDomain %></a>,
         you need to enable IPv6 on your computer.
     </p>
     <% } %>