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-Lately I've been toying a lot with [[http://plackperl.org/][Plack]] and
-two Perl web framework:
-[[http://search.cpan.org/perldoc?Tatsumaki][Tatsumaki]] and
-[[http://search.cpan.org/perldoc?Dancer][Dancer]]. I use both of them
-for different purposes, as their features complete each other.
-
-** Plack
-
-If you don't already know what Plack is, you would want to take a look
-at the following Plack resources:
-
--  [[http://plackperl.org][Plack (redesigned) website]]
--  [[http://search.cpan.org/perldoc?Plack][Plack documentation]]
--  [[http://bulknews.typepad.com/blog/2009/11/plack-and-psgi-screencast-and-feedbacks.html][Miyagawa's
-   screencast]]
--  [[http://advent.plackperl.org/][Plack advent calendar]]
-
-#+BEGIN_QUOTE
-  As [[http://www.sukria.net/][sukria]] is planning to talk about
-  [[http://perldancer.org][Dancer]] during the
-  [[http://journeesperl.fr/fpw2010/index.html][FPW 2010]], I will
-  probably do a talk about Plack.
-#+END_QUOTE
-
-After reading some code, I've started to write two middleware: the first
-one add ETag header to the HTTP response, and the second one provides a
-way to limit access to your application.
-
-*** Plack::Middleware::ETag
-
-This middleware is really simple: for each request, an
-[[http://en.wikipedia.org/wiki/HTTP_ETag][ETag]] header is added to the
-response. The ETag value is a sha1 of the response's content. In case
-the content is a file, it works like apache, using various information
-from the file: inode, modified time and size. This middleware can be
-used with
-[[http://search.cpan.org/perldoc?Plack::Middleware::ConditionalGET][Plack::Middleware::ConditionalGET]],
-so the client will have the ETag information for the page, and when he
-will do a request next time, it will send an "if-modified" header. If
-the ETag is the same, a 304 response will be send, meaning the content
-have not been modified. This module is
-[[http://search.cpan.org/perldoc?Plack::Middleware::ETag][available on
-CPAN]].
-
-Let's see how it works. First, we create a really simple application (we
-call it app.psgi):
-
-#+BEGIN_SRC perl
-    #!/usr/bin/env perl
-    use strict;
-    use warnings;
-    use Plack::Builder;
-
-    builder {
-        enable "Plack::Middleware::ConditionalGET";
-        enable "Plack::Middleware::ETag";
-        sub {
-            ['200', ['Content-Type' => 'text/html'], ['Hello world']];
-        };
-    };
-#+END_SRC
-
-Now we can test it:
-
-#+BEGIN_EXAMPLE
-    % plackup app.psgi&
-    % curl -D - http://localhost:5000
-    HTTP/1.0 200 OK
-    Date: Sat, 03 Apr 2010 09:31:43 GMT
-    Server: HTTP::Server::PSGI
-    Content-Type: text/html
-    ETag: 7b502c3a1f48c8609ae212cdfb639dee39673f5e
-    Content-Length: 11
-
-    % curl -H "If-None-Match: 7b502c3a1f48c8609ae212cdfb639dee39673f5e" -D - http://localhost:5000
-    HTTP/1.0 304 Not Modified
-    Date: Sat, 03 Apr 2010 09:31:45 GMT
-    Server: HTTP::Server::PSGI
-    ETag: 7b502c3a1f48c8609ae212cdfb639dee39673f5e
-#+END_EXAMPLE
-
-*** Plack::Middleware::Throttle
-
-[[http://git.lumberjaph.net/p5-plack-middleware-throttle.git/][With this
-middleware]], you can control how many times you want to provide an
-access to your application. This module is not yet on CPAN, has I want
-to add some features, but you can get the code from git. There is four
-methods to control access:
-
--  Plack::Middleware::Throttle::Hourly: how many times in one hour
-   someone can access the application
--  P::M::T::Daily: the same, but for a day
--  P::M::T::Interval: which interval the client must wait between two
-   query
--  by combining the three previous methods
-
-To store sessions informations, you can use any cache backend that
-provides =get=, =set= and =incr= methods. By default, if no backend is
-provided, it will store informations in a hash. You can easily modify
-the defaults throttling strategies by subclassing all the classes.
-
-Let's write another application to test it:
-
-#+BEGIN_SRC perl
-    #!/usr/bin/env perl
-    use strict;
-    use warnings;
-    use Plack::Builder;
-
-    builder {
-        enable "Plack::Middleware::Throttle::Hourly", max => 2;
-        sub {
-            ['200', ['Content-Type' => 'text/html'], ['Hello world']];
-        };
-    };
-#+END_SRC
-
-then test
-
-#+BEGIN_EXAMPLE
-    % curl -D - http://localhost:5000/
-    HTTP/1.0 200 OK
-    Date: Sat, 03 Apr 2010 09:57:40 GMT
-    Server: HTTP::Server::PSGI
-    Content-Type: text/html
-    X-RateLimit-Limit: 2
-    X-RateLimit-Remaining: 1
-    X-RateLimit-Reset: 140
-    Content-Length: 11
-
-    Hello world
-
-    % curl -D - http://localhost:5000/
-    HTTP/1.0 200 OK
-    Date: Sat, 03 Apr 2010 09:57:40 GMT
-    Server: HTTP::Server::PSGI
-    Content-Type: text/html
-    X-RateLimit-Limit: 2
-    X-RateLimit-Remaining: 0
-    X-RateLimit-Reset: 140
-    Content-Length: 11
-
-    Hello world
-
-    % curl -D - http://localhost:5000/
-    HTTP/1.0 503 Service Unavailable
-    Date: Sat, 03 Apr 2010 09:57:41 GMT
-    Server: HTTP::Server::PSGI
-    Content-Type: text/plain
-    X-RateLimit-Reset: 139
-    Content-Length: 15
-
-    Over rate limit
-#+END_EXAMPLE
-
-Some HTTP headers are added to the response :
-
--  *X-RateLimit-Limit*: how many request can be done
--  *X-RateLimit-Remaining*: how many requests are available
--  *X-RateLimit-Reset*: when will the counter be reseted (in seconds)
-
-This middleware could be a very good companion to the
-[[http://www.sukria.net/fr/archives/2010/03/19/let-the-dancer-rest/][Dancer
-REST stuff]]
-[[/easily-create-rest-interface-with-the-dancer-1.170/][added
-recently]].
-
-** another Tatsumaki application with Plack middlewares
-
-To demonstrate the use of this two middleware,
-[[http://git.lumberjaph.net/p5-feeddiscovery.git/][I wrote a small
-application]] with Tatsumaki. This application fetch a page, parse it to
-find all the feeds declared, and return a JSON with the result.
-
-#+BEGIN_EXAMPLE
-    % GET http://feeddiscover.tirnan0g.org/?url=http://lumberjaph.net/blog/
-#+END_EXAMPLE
-
-will return
-
-#+BEGIN_EXAMPLE
-    % [{"href":"http://lumberjaph.net/blog/index.php/feed/","type":"application/rss+xml","title":"i'm a lumberjaph RSS Feed"}]
-#+END_EXAMPLE
-
-This application is composed of one handler, that handle only *GET*
-request. The request will fetch the url given in the *url* parameter,
-scrap the content to find the links to feeds, and cache the result with
-Redis. The response is a JSON string with the informations.
-
-The interesting part is the app.psgi file:
-
-#+BEGIN_SRC perl
-    my $app = Tatsumaki::Application->new(['/' => 'FeedDiscovery::Handler'],);
-
-    builder {
-        enable "Plack::Middleware::ConditionalGET";
-        enable "Plack::Middleware::ETag";
-        enable "Plack::Middleware::Throttle::Hourly",
-            backend => Redis->new(server => '127.0.0.1:6379',),
-            max     => 100;
-        $app;
-    };
-#+END_SRC
-
-The application itself is really simple: for a given url, the
-Tatsumaki::HTTPClient fetch an url, I use
-[[http://search.cpan.org/perldoc?Web::Scraper][Web::Scraper]] to find
-the *link rel="alternate"* from the page, if something is found, it's
-stored in Redis, then a JSON string is returned to the client.