Update app.py

app.py

@@ -483,21 +483,35 @@ HTML_CONTENT = """
 
             while (retryCount < maxRetries) {
                 try {
-                    const response = await fetch('/upload', {
-                        method: 'POST',
-                        body: formData
+                    const xhr = new XMLHttpRequest();
+                    xhr.open('POST', '/upload', true);
+                    xhr.upload.onprogress = (event) => updateProgress(event, progressBar.querySelector('.progress'));
+                    
+                    xhr.onload = function() {
+                        if (xhr.status === 200) {
+                            const response = JSON.parse(xhr.responseText);
+                            if (response.url) {
+                                addResultLink(response.url, file.name);
+                            } else {
+                                alert('Upload failed: ' + response.error);
+                            }
+                        } else {
+                            throw new Error(`HTTP error! status: ${xhr.status}`);
+                        }
+                    };
+
+                    xhr.onerror = function() {
+                        throw new Error('Network error occurred');
+                    };
+
+                    xhr.send(formData);
+
+                    // Wait for the request to complete
+                    await new Promise((resolve, reject) => {
+                        xhr.onloadend = resolve;
+                        xhr.onerror = reject;
                     });
 
-                    if (!response.ok) {
-                        throw new Error(`HTTP error! status: ${response.status}`);
-                    }
-
-                    const result = await response.json();
-                    if (result.url) {
-                        addResultLink(result.url, file.name);
-                    } else {
-                        alert('Upload failed: ' + result.error);
-                    }
                     break; // Success, exit the loop
                 } catch (error) {
                     console.error('Upload error:', error);