Plack::Middleware::StackTrace - Displays stack trace when your app dies


  enable "StackTrace";


This middleware catches exceptions (run-time errors) happening in your application and displays nice stack trace screen.

This middleware is enabled by default when you run plackup in the default development mode.

You're recommended to use this middleware during the development and use Plack::Middleware::HTTPExceptions in the deployment mode as a replacement, so that all the exceptions thrown from your application still get caught and rendered as a 500 error response, rather than crashing the web server.

Catching errors in streaming response is not supported.


  enable "StackTrace", force => 1;

Force display the stack trace when an error occurs within your application and the response code from your application is 500. Defaults to off.

The use case of this option is that when your framework catches all the exceptions in the main handler and returns all failures in your code as a normal 500 PSGI error response. In such cases, this middleware would never have a chance to display errors because it can't tell if it's an application error or just random eval in your code. This option enforces the middleware to display stack trace even if it's not the direct error thrown by the application.

  enable "StackTrace", no_print_errors => 1;

Skips printing the text stacktrace to console (psgi.errors). Defaults to 0, which means the text version of the stack trace error is printed to the errors handle, which usually is a standard error.


Tokuhiro Matsuno

Tatsuhiko Miyagawa


Devel::StackTrace::AsHTML Plack::Middleware Plack::Middleware::HTTPExceptions