[Catalyst] [ANNOUNCE] Catalyst-Runtime-5.89002-TRIAL PSGI Catalyst - third development release

Lars Dɪᴇᴄᴋᴏᴡ 迪拉斯 daxim at cpan.org
Thu Mar 3 15:26:48 GMT 2011

Fernan Aguero ✍:
> what plack/psgi is and/or why I should care
I hear that often, so here's the elevator pitch I'm usually telling to convey 
the basic idea.

Catalyst is a Web framework that runs on several Web servers. The different 
parts necessary to make this work are separated out into adapter classes such 
as Catalyst::Engine::Apache2::MP20. There are quite a number of them.

Then framework X comes along and has to implement these adapters suitable for 
its codebase, too, and so on for every new framework.

This repetition is not a good thing, and the frameworks want to get rid of it. 
The various adapters are written just once, outside of the frameworks, and 
with a standardised interface. The frameworks now only need exactly one 
adapter each, adhering to that interface.

That interface spec is called PSGI; the implementation is called Plack.

Apart from less code for each framework, there is the other advantage that 
adding support for a new Web server (e.g. Plack::Handler::Mongrel2) 
automatically enables this Web server for any PSGI-compliant framework.

While it has been possible to run Catalyst 5.8 on top of PSGI-enabled Web 
servers with Catalyst::Engine::PSGI, Catalyst 5.9 goes native and cuts out one 
layer of indirection.

Now that you know that, you should be able to answer the "Question 2" 
questions yourself.
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