fix: Fix Rack 3 support

Author: YOU54F

.github/workflows/test.yml

@@ -9,7 +9,10 @@ jobs:
       matrix:
         ruby_version: ["2.7", "3.0", "3.1", "3.2", "3.3"]
         os: ["ubuntu-latest","windows-latest","macos-latest"]
+        rack_version: ["2", "3"]
     runs-on: ${{ matrix.os }}
+    env:
+      RACK_VERSION: ${{ matrix.rack_version }}
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1

lib/pact/consumer/mock_service/rack_request_helper.rb

@@ -24,7 +24,7 @@ def request_as_hash_from env
         end
 
         request[:headers] = headers_from env
-        body_string = request[:body].read
+        body_string = request[:body]&.read || ""
 
         if body_string.empty?
           request.delete :body

lib/pact/consumer/server.rb

@@ -1,6 +1,7 @@
 require 'uri'
 require 'net/http'
 require 'rack'
+require 'rack/handler/webbrick'
 
 # Copied shamelessly from Capybara
 # Used to run a mock service in a new thread when started by the AppManager or the ControlServer
@@ -66,11 +67,6 @@ def responsive?
     end
 
     def run_default_server(app, port)
-      begin
-        require 'rack/handler/webrick'
-      rescue LoadError
-        require 'rackup/handler/webrick'
-      end
       Rack::Handler::WEBrick.run(app, **webrick_opts) do |server|
         @port = server[:Port]
       end

lib/pact/mock_service/control_server/run.rb

@@ -1,5 +1,6 @@
 require 'pact/mock_service/control_server/app'
 require 'pact/mock_service/server/webrick_request_monkeypatch'
+require 'rack/handler/webbrick'
 
 module Pact
   module MockService

lib/pact/mock_service/run.rb

@@ -5,6 +5,7 @@
 require 'pact/mock_service/server/webrick_request_monkeypatch'
 require 'pact/specification_version'
 require 'pact/support/metrics'
+require 'rack/handler/webbrick'
 
 module Pact
   module MockService

lib/rack/handler/webbrick.rb

@@ -0,0 +1,12 @@
+module Rack
+  module Handler
+      begin
+        require 'rack/handler/webrick'
+        WEBrick = Class.new(Rack::Handler::WEBrick)
+      rescue LoadError
+        require 'rackup/handler/webrick'
+        WEBrick = Class.new(Rackup::Handler::WEBrick)
+      end
+  end
+end
+

pact-mock_service.gemspec

@@ -20,8 +20,12 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.license       = 'MIT'
 
-  gem.add_runtime_dependency 'rack', '>= 2.0', '< 4.0'
-  gem.add_runtime_dependency 'rackup', '~> 2.0'
+  if ENV['RACK_VERSION'] == '2'
+    gem.add_runtime_dependency 'rack', '>= 2.0', '< 3.0'
+  else
+    gem.add_runtime_dependency 'rack', '>= 3.0', '< 4.0'
+    gem.add_runtime_dependency 'rackup', '~> 2.0'
+  end
   gem.add_runtime_dependency 'rspec', '>=2.14'
   gem.add_runtime_dependency 'find_a_port', '~> 1.0.1'
   gem.add_runtime_dependency 'thor', '>= 0.19', '< 2.0'