Plack::Middleware::ErrorDocument(3pm) User Contributed Perl Documentation Plack::Middleware::ErrorDocument(3pm)

Plack::Middleware::ErrorDocument - Set Error Document based on HTTP status code

  # in app.psgi
  use Plack::Builder;
  builder {
      enable "Plack::Middleware::ErrorDocument",
          500 => '/uri/errors/500.html', 404 => '/uri/errors/404.html',
          subrequest => 1;
      $app;
  };

Plack::Middleware::ErrorDocument allows you to customize error screen by setting paths (file system path or URI path) of error pages per status code.

A boolean flag to serve error pages using a new GET sub request. Defaults to false, which means it serves error pages using file system path. 

  builder {
      enable "Plack::Middleware::ErrorDocument",
          502 => '/home/www/htdocs/errors/maint.html';
      enable "Plack::Middleware::ErrorDocument",
          404 => '/static/404.html', 403 => '/static/403.html', subrequest => 1;
      $app;
  };

This configuration serves 502 error pages from file system directly assuming that's when you probably maintain database etc. but serves 404 and 403 pages using a sub request so your application can do some logic there like logging or doing suggestions.

When using a subrequest, the subrequest should return a regular '200' response.

Tatsuhiko Miyagawa

2024-01-20 perl v5.38.2