!fix: use rack-reverse-proxy fix for rack 3 compat

note using pr fix from unmaintained gem waterlink/rack-reverse-proxy#73

Gemfile

@@ -9,3 +9,9 @@ if ENV['X_PACT_DEVELOPMENT']
   gem "pact-message", path: '../pact-message-ruby'
   gem "pact-support", path: '../pact-support'
 end
+
+if ENV['RACK_VERSION'] == '2'
+  gem 'rack-reverse-proxy'
+else
+  gem 'rack-reverse-proxy', git: 'https://github.com/samedi/rack-reverse-proxy.git', ref: '06f21feb6afbbf902969c4f1df219df8f2080387'
+end

pact-provider-verifier.gemspec

@@ -26,9 +26,13 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'faraday', '~> 2.5'
   gem.add_runtime_dependency 'faraday-retry', '~> 2.2'
   gem.add_runtime_dependency 'json',  '>1.8'
-  gem.add_runtime_dependency 'rack', '>= 3.0', '< 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 'rack-reverse-proxy'
   gem.add_runtime_dependency 'rspec_junit_formatter', '~> 0.3'
   gem.add_runtime_dependency 'ostruct'

spec/support/provider-echo-host.ru

@@ -2,5 +2,5 @@ require 'json'
 
 run -> (env) {
   body = {"Host" => env['HTTP_HOST']}.to_json
-  [200, {"Content-Type" => "application/json"}, [body]]
+  [200, {"content-type" => "application/json"}, [body]]
 }

spec/support/provider_with_self_signed_cert.rb

@@ -3,7 +3,7 @@
 def run_provider_with_self_signed_cert port
   # trap 'INT' do @server.shutdown end
   require 'rack'
-  require 'rack/handler/webrick'
+  require_relative 'webbrick'
   require 'webrick/https'
 
   webrick_opts = {:Port => port, :SSLEnable => true, :SSLCertName => [%w[CN localhost]]}

spec/support/webbrick.rb

@@ -0,0 +1,11 @@
+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