diff --git a/Dockerfile b/Dockerfile
index 1825bd7..c108693 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,7 @@ RUN go mod download
 COPY src/ .
 
 ENV CGO_ENABLED=1
+ENV GIN_MODE=release
 RUN go build -o server .
 
 FROM alpine:latest
diff --git a/templates/index.html b/templates/index.html
index 7fb941e..11ff149 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -289,21 +289,28 @@
         };
 
         xhr.onload = () => {
-            try {
-                const data = JSON.parse(xhr.responseText);
-                if (data.error) throw new Error(data.error);
+            // Check if the server actually returned a success status (200-299)
+            if (xhr.status >= 200 && xhr.status < 300) {
+                try {
+                    const data = JSON.parse(xhr.responseText);
+                    if (data.error) throw new Error(data.error);
 
-                document.getElementById('upload-ui').classList.add('hidden');
-                document.getElementById('success-ui').classList.remove('hidden');
+                    document.getElementById('upload-ui').classList.add('hidden');
+                    document.getElementById('success-ui').classList.remove('hidden');
 
-                const dlUrl = window.location.origin + data.download_url;
-                const delUrl = `${window.location.origin}${data.delete_url}`;
+                    const dlUrl = window.location.origin + data.download_url;
+                    const delUrl = `${window.location.origin}${data.delete_url}`;
 
-                document.getElementById('res-url').value = dlUrl;
-                document.getElementById('res-del').value = delUrl;
-            } catch (err) {
-                alert(err.message || "An error occurred");
-                location.reload();
+                    document.getElementById('res-url').value = dlUrl;
+                    document.getElementById('res-del').value = delUrl;
+                } catch (err) {
+                    console.error("JSON Parse Error. Server sent:", xhr.responseText);
+                    alert("Server returned an invalid response. Check console (F12) for details.");
+                }
+            } else {
+                // If the server sent a 404, 413 (File too large), or 500 error
+                console.error("Server Error:", xhr.status, xhr.responseText);
+                alert(`Upload failed with status ${xhr.status}. Check console.`);
             }
         };