Update app.py

app.py

@@ -92,14 +92,20 @@ def compress():
         
         # If final size is too large, inform but still provide the file
         if final_size_kb > target_kb:
-            return jsonify({
-                "warning": f"Unable to compress below {target_kb:.2f} KB. Best compressed size is {int(final_size_kb)} KB.",
-                "original_size_kb": round(original_size_kb, 2),
-                "compressed_size_kb": round(final_size_kb, 2),
-                "target_size_kb": round(target_kb, 2),
-                "compression_ratio": round((original_size_kb - final_size_kb) / original_size_kb * 100, 2),
-                "download_available": True
-            }), 200
+            # Important! Check Accept header to determine what client expects
+            accepts = request.headers.get('Accept', '')
+            
+            # If client expects JSON (or we're not sure), send the warning JSON first
+            if 'application/json' in accepts or '*/*' in accepts:
+                # The frontend should handle this warning specially
+                return jsonify({
+                    "warning": f"Unable to compress below {target_kb:.2f} KB. Best compressed size is {int(final_size_kb)} KB.",
+                    "original_size_kb": round(original_size_kb, 2),
+                    "compressed_size_kb": round(final_size_kb, 2),
+                    "target_size_kb": round(target_kb, 2),
+                    "compression_ratio": round((original_size_kb - final_size_kb) / original_size_kb * 100, 2),
+                    "download_available": True
+                }), 200
             
         # Return the compressed file
         response = send_file(output_path, as_attachment=True, download_name="compressed.pdf")