diff --git a/lib/doorkeeper/request/authorization_code.rb b/lib/doorkeeper/request/authorization_code.rb
index 9b5d74eec..5c49870e0 100644
--- a/lib/doorkeeper/request/authorization_code.rb
+++ b/lib/doorkeeper/request/authorization_code.rb
@@ -3,15 +3,10 @@
 module Doorkeeper
   module Request
     class AuthorizationCode < Strategy
-      attr_accessor :grant, :client
-
-      def initialize(server)
-        super
-        @grant, @client = server.grant, server.client
-      end
+      delegate :grant, :client, :parameters, to: :server
 
       def request
-        @request ||= OAuth::AuthorizationCodeRequest.new(Doorkeeper.configuration, grant, client, server.parameters)
+        @request ||= OAuth::AuthorizationCodeRequest.new(Doorkeeper.configuration, grant, client, parameters)
       end
     end
   end
diff --git a/lib/doorkeeper/request/client_credentials.rb b/lib/doorkeeper/request/client_credentials.rb
index e65b3467e..e41ceaa11 100644
--- a/lib/doorkeeper/request/client_credentials.rb
+++ b/lib/doorkeeper/request/client_credentials.rb
@@ -3,15 +3,10 @@
 module Doorkeeper
   module Request
     class ClientCredentials < Strategy
-      attr_accessor :client
-
-      def initialize(server)
-        super
-        @client = server.client
-      end
+      delegate :client, :parameters, to: :server
 
       def request
-        @request ||= OAuth::ClientCredentialsRequest.new(Doorkeeper.configuration, client, server.parameters)
+        @request ||= OAuth::ClientCredentialsRequest.new(Doorkeeper.configuration, client, parameters)
       end
     end
   end
diff --git a/lib/doorkeeper/request/code.rb b/lib/doorkeeper/request/code.rb
index c3e045c6e..606f64611 100644
--- a/lib/doorkeeper/request/code.rb
+++ b/lib/doorkeeper/request/code.rb
@@ -3,15 +3,14 @@
 module Doorkeeper
   module Request
     class Code < Strategy
-      attr_accessor :pre_auth
+      delegate :current_resource_owner, to: :server
 
-      def initialize(server)
-        super
-        @pre_auth = server.context.send(:pre_auth)
+      def pre_auth
+        server.context.send(:pre_auth)
       end
 
       def request
-        @request ||= OAuth::CodeRequest.new(pre_auth, server.current_resource_owner)
+        @request ||= OAuth::CodeRequest.new(pre_auth, current_resource_owner)
       end
     end
   end
diff --git a/lib/doorkeeper/request/password.rb b/lib/doorkeeper/request/password.rb
index 977eb0fa3..86f1a4f8e 100644
--- a/lib/doorkeeper/request/password.rb
+++ b/lib/doorkeeper/request/password.rb
@@ -3,16 +3,10 @@
 module Doorkeeper
   module Request
     class Password < Strategy
-      attr_accessor :credentials, :resource_owner
-
-      def initialize(server)
-        super
-        @credentials = server.credentials
-        @resource_owner = server.resource_owner
-      end
+      delegate :credentials, :resource_owner, :parameters, to: :server
 
       def request
-        @request ||= OAuth::PasswordAccessTokenRequest.new(Doorkeeper.configuration, credentials, resource_owner, server.parameters)
+        @request ||= OAuth::PasswordAccessTokenRequest.new(Doorkeeper.configuration, credentials, resource_owner, parameters)
       end
     end
   end
diff --git a/lib/doorkeeper/request/refresh_token.rb b/lib/doorkeeper/request/refresh_token.rb
index 159b45d34..d38906988 100644
--- a/lib/doorkeeper/request/refresh_token.rb
+++ b/lib/doorkeeper/request/refresh_token.rb
@@ -3,16 +3,14 @@
 module Doorkeeper
   module Request
     class RefreshToken < Strategy
-      attr_accessor :refresh_token, :credentials
+      delegate :credentials, :parameters, to: :server
 
-      def initialize(server)
-        super
-        @refresh_token = server.current_refresh_token
-        @credentials = server.credentials
+      def refresh_token
+        server.current_refresh_token
       end
 
       def request
-        @request ||= OAuth::RefreshTokenRequest.new(Doorkeeper.configuration, refresh_token, credentials, server.parameters)
+        @request ||= OAuth::RefreshTokenRequest.new(Doorkeeper.configuration, refresh_token, credentials, parameters)
       end
     end
   end
diff --git a/lib/doorkeeper/request/token.rb b/lib/doorkeeper/request/token.rb
index 55e398d44..bc542da44 100644
--- a/lib/doorkeeper/request/token.rb
+++ b/lib/doorkeeper/request/token.rb
@@ -3,15 +3,14 @@
 module Doorkeeper
   module Request
     class Token < Strategy
-      attr_accessor :pre_auth
+      delegate :current_resource_owner, to: :server
 
-      def initialize(server)
-        super
-        @pre_auth = server.context.send(:pre_auth)
+      def pre_auth
+        server.context.send(:pre_auth)
       end
 
       def request
-        @request ||= OAuth::TokenRequest.new(pre_auth, server.current_resource_owner)
+        @request ||= OAuth::TokenRequest.new(pre_auth, current_resource_owner)
       end
     end
   end