anchor.diff:      if (LOG_REQUESTS) print(createSessionLog(request).toString());
       htmlResponse = createHtmlResponse(request).toString();
   //  if (LOG_REQUESTS) print(createSessionLog(request, session).toString());
  -  } on Exception catch (err) {
  -    htmlResponse = createErrorPage(err.toString()).toString();
  +  } catch (err, st) {
  +    htmlResponse = createErrorPage(err.toString() + st.toString()).toString();
     }
     response.headers.add("Content-Type", "text/html; charset=UTF-8");
     response.write(htmlResponse);
  
positive.code:       </head>
        <body>
          <h1> *** Internal Error ***</h1><br>
          <pre>Server error occured: ${makeSafe(new StringBuffer(errorMessage)).toString()}</pre><br>
        </body>
      </html>''');
  }
  
negative.code:       print("Serving $REQUEST_PATH on http://${HOST}:${PORT}.");
      });
  
    } catch(err, st){
      print(err);
      print(st);
    }
  