Compatibility with Rack 3

* Rack has removed Mongrel support ages ago [[1]]. Replace it with
  WEBrick.
* Rack split the webserver handlers into Rackup [[2]]
* Use Rack::Handler.default which easily allows to choose even different
  servers then WEBrick [[3]]

[1]: rack/rack@2577f0b
[2]: rack/rack@91c9c7f
[3]: igrigorik#370 (comment)

Author: voxik

benchmarks/server.rb

@@ -15,7 +15,7 @@ module Benchmark
   class Server < Sinatra::Base
 
     def self.run
-      Rack::Handler::WEBrick.run(
+      Rackup::Handler.get('webrick').run(
         Benchmark::Server.new,
         :Port => 9292,
         :AccessLog => [],

em-http-request.gemspec

@@ -21,9 +21,10 @@ Gem::Specification.new do |s|
   s.add_dependency 'eventmachine', '>= 1.0.3'
   s.add_dependency 'http_parser.rb', '>= 0.6.0'
 
-  s.add_development_dependency 'mongrel', '~> 1.2.0.pre2'
+  s.add_development_dependency 'webrick'
   s.add_development_dependency 'multi_json'
-  s.add_development_dependency 'rack', '< 2.0'
+  s.add_development_dependency 'rack'
+  s.add_development_dependency 'rackup'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
 

spec/stallion.rb

@@ -4,6 +4,7 @@
 # #--
 
 require 'rack'
+require 'rackup/handler'
 
 module Stallion
   class Mount
@@ -16,7 +17,7 @@ def ride
     end
 
     def match?(request)
-      method = request['REQUEST_METHOD']
+      method = request.respond_to?(:params) ? request.params['REQUEST_METHOD'] : request['REQUEST_METHOD']
       @methods.empty? or @methods.include?(method)
     end
   end
@@ -56,9 +57,9 @@ def self.run(options = {})
 
     ruby_version = RUBY_VERSION.split('.').map(&:to_i)
     if ruby_version[0] >= 3
-      Rack::Handler::Mongrel.run(Rack::Lint.new(self), **options)
+      Rackup::Handler.default.run(Rack::Lint.new(self), **options)
     else
-      Rack::Handler::Mongrel.run(Rack::Lint.new(self), options)
+      Rackup::Handler.default.run(Rack::Lint.new(self), options)
     end
   end