Update app.py

app.py

@@ -302,7 +302,8 @@ def generate_plots():
         buf = io.BytesIO()
         plt.savefig(buf, format='png')
         plt.close()
-        plot_buffers.append(buf.getvalue())
+        # Encode to base64 and prepend data URI
+        plot_buffers.append(base64.b64encode(buf.getvalue()).decode('utf-8'))
     except Exception as e:
         print(f"Error generating Decision Breakdown plot: {e}")
         plot_buffers.append(None) # Append None if plot generation fails
@@ -324,7 +325,8 @@ def generate_plots():
             buf = io.BytesIO()
             plt.savefig(buf, format='png')
             plt.close()
-            plot_buffers.append(buf.getvalue())
+            # Encode to base64 and prepend data URI
+            plot_buffers.append(base64.b64encode(buf.getvalue()).decode('utf-8'))
         else:
             plot_buffers.append(None)
     except Exception as e:
@@ -342,7 +344,8 @@ def generate_plots():
         buf = io.BytesIO()
         plt.savefig(buf, format='png')
         plt.close()
-        plot_buffers.append(buf.getvalue())
+        # Encode to base64 and prepend data URI
+        plot_buffers.append(base64.b64encode(buf.getvalue()).decode('utf-8'))
     except Exception as e:
         print(f"Error generating Miles Distribution plot: {e}")
         plot_buffers.append(None)
@@ -362,7 +365,8 @@ def generate_plots():
             buf = io.BytesIO()
             plt.savefig(buf, format='png')
             plt.close()
-            plot_buffers.append(buf.getvalue())
+            # Encode to base64 and prepend data URI
+            plot_buffers.append(base64.b64encode(buf.getvalue()).decode('utf-8'))
         else:
             plot_buffers.append(None)
     except Exception as e: