plack::loader::delayed(3pm) [debian man page]

Plack::Loader::Delayed(3pm)				User Contributed Perl Documentation			       Plack::Loader::Delayed(3pm)

NAME

       Plack::Loader::Delayed - Delay the loading of .psgi until the first run

SYNOPSIS

	 plackup -s Starlet -L Delayed myapp.psgi

DESCRIPTION

       This loader delays the compilation of specified PSGI application until the first request time. This prevents bad things from happening with
       preforking web servers like Starlet, when your application manipulates resources such as sockets or database connections in the master
       startup process and then shared by children.

       You can combine this loader with "-M" command line option, like:

	 plackup -s Starlet -MCatalyst -L Delayed myapp.psgi

       loads the module Catalyst in the master process for the better process management with copy-on-write, however the application "myapp.psgi"
       is loaded per children.

       Starman since version 0.2000 loads this loader by default unless you specify the command line option "--preload-app" for the starman
       executable.

DEVELOPERS

       Web server developers can make use of "psgi_app_builder" attribute callback set in Plack::Handler, to load the application earlier than the
       first request time.

AUTHOR

       Tatsuhiko Miyagawa

SEE ALSO

       plackup

perl v5.14.2							    2011-02-27					       Plack::Loader::Delayed(3pm)

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

NAME

       Plack::Middleware::Lint - Validate request and response

SYNOPSIS

	 use Plack::Middleware::Lint;

	 my $app = sub { ... }; # your app or middleware
	 $app = Plack::Middleware::Lint->wrap($app);

	 # Or from plackup
	 plackup -e 'enable "Lint"' myapp.psgi

DESCRIPTION

       Plack::Middleware::Lint is a middleware component to validate request and response environment formats. You are strongly suggested to use
       this middleware when you develop a new framework adapter or a new PSGI web server that implements the PSGI interface.

       This middleware is enabled by default when you run plackup or other launcher tools with the default environment development value.

DEBUGGING

       Because of how this middleware works, it may not be easy to debug Lint errors when you encounter one, unless you're writing a PSGI web
       server or a framework.

       For example, when you're an application developer (user of some framework) and see errors like:

	 Body should be an array ref or filehandle at lib/Plack/Middleware/Lint.pm line XXXX

       there's no clue about which line of your application produces that error.

       We're aware of the issue, and have a plan to spit out more helpful errors to diagnose the issue. But until then, currently there are some
       workarounds to make this easier. For now, the easiest one would be to enable Plack::Middleware::REPL outside of the Lint middleware, like:

	 plackup -e 'enable "REPL"; enable "Lint"' app.psgi

       so that the Lint errors are caught by the REPL shell, where you can inspect all the variables in the response.

AUTHOR

       Tatsuhiko Miyagawa

       Tokuhiro Matsuno

SEE ALSO

       Plack

perl v5.14.2							    2011-09-22					      Plack::Middleware::Lint(3pm)