Talk:Rack (web server interface)

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Why Rack is so significant[edit]

Rack is now so significant within the Ruby community that "rack-compliant" is now a technical term.

Wikipedia, however, is likely still PHP ;-)

I will put together some notes on why Rack is so important - even if missing from some standard English WP pages. I can move on to Fr, De and other European pages after.

Quotes: Rack aims to provide a minimal API for connecting web servers and web frameworks.

Informally, a Rack application is a thing that responds to #call and takes a hash as argument, returning an array of status, headers and a body. The body needs to respond to #each and then successively return strings that represent the response body. [...] Please note that this API is mainly used by framework developers and usually will not be exposed to framework users. —Preceding unsigned comment added by Grshiplett (talkcontribs) 22:15, 18 December 2009 (UTC)

Why Rack is cool[edit]

Quote: the really cool thing about Rack is that it provides an extremely easy way to combine these web applications. After all, they are only Ruby objects with a single method that matters. And the thing that calls you must not really be a web server, but could as well be a different application! Let me show you a few Rack filters (or “middleware”) that already exist:

  • Rack::ShowExceptions catches all thrown exceptions and wraps them nicely in an helpful 500-page adapted from Django.
  • Rack::CommonLogger does Apache-style logs.
  • Rack::URLMap redirects to different Rack applications depending on the path and host (a very simple router).

There is another tool, Rack::Lint that checks if your applications and filters play nicely with others so everything ought to work together. —Preceding unsigned comment added by Grshiplett (talkcontribs) 22:16, 18 December 2009 (UTC)

What Rack offers[edit]

QUOTE: What do you gain if your web framework/server/application supports Rack?

  • Handlers for WEBrick, Mongrel and plain CGI (soon FastCGI, too), and every new webserver that provides a Rack handler. (Let n and m be the amount of servers and frameworks, without Rack it’s n*m, but with it’s n+m, which means less work for everyone.)
  • The possibility to run several applications inside a single webserver without external configuration.
  • Easier (integration and functional) testing, since everything can easily be mocked. (Helpers for this are coming soon, too.)
  • A greater diversity among frameworks, since writers now can concentrate on the parts that make it special and stop wasting their time on boring things. —Preceding unsigned comment added by Grshiplett (talkcontribs) 22:18, 18 December 2009 (UTC)

Explanation of hello world example[edit]

The example is not really clear what the lines in the example do, some more comments would be nice (talk) 02:02, 7 October 2010 (UTC)bob bobberson