5 files changed, 15 insertions, 13 deletions
diff --git a/actionpack/lib/action_dispatch/http/filter_parameters.rb b/actionpack/lib/action_dispatch/http/filter_parameters.rb
index 077ab2561f..eb6761d067 100644
--- a/actionpack/lib/action_dispatch/http/filter_parameters.rb
+++ b/actionpack/lib/action_dispatch/http/filter_parameters.rb
@@ -1,4 +1,4 @@
-require "action_dispatch/http/parameter_filter"
+require_relative "parameter_filter"
 
 module ActionDispatch
   module Http
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index 74a3afab44..5a0f661d99 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -337,4 +337,4 @@ module Mime
   end
 end
 
-require "action_dispatch/http/mime_types"
+require_relative "mime_types"
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 6d42404a98..914163f219 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -1,15 +1,16 @@
+# frozen_string_literal: true
 require "stringio"
 
 require "active_support/inflector"
-require "action_dispatch/http/headers"
+require_relative "headers"
 require "action_controller/metal/exceptions"
 require "rack/request"
-require "action_dispatch/http/cache"
-require "action_dispatch/http/mime_negotiation"
-require "action_dispatch/http/parameters"
-require "action_dispatch/http/filter_parameters"
-require "action_dispatch/http/upload"
-require "action_dispatch/http/url"
+require_relative "cache"
+require_relative "mime_negotiation"
+require_relative "parameters"
+require_relative "filter_parameters"
+require_relative "upload"
+require_relative "url"
 require "active_support/core_ext/array/conversions"
 
 module ActionDispatch
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 3c91677d55..eab663e2e0 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -1,6 +1,6 @@
 require "active_support/core_ext/module/attribute_accessors"
-require "action_dispatch/http/filter_redirect"
-require "action_dispatch/http/cache"
+require_relative "filter_redirect"
+require_relative "cache"
 require "monitor"
 
 module ActionDispatch # :nodoc:
@@ -103,7 +103,7 @@ module ActionDispatch # :nodoc:
 
       def body
         @str_body ||= begin
-          buf = ""
+          buf = "".dup
           each { |chunk| buf << chunk }
           buf
         end
diff --git a/actionpack/lib/action_dispatch/http/url.rb b/actionpack/lib/action_dispatch/http/url.rb
index f902fe36e0..28672e2a1a 100644
--- a/actionpack/lib/action_dispatch/http/url.rb
+++ b/actionpack/lib/action_dispatch/http/url.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/module/attribute_accessors"
 
 module ActionDispatch
@@ -155,7 +156,7 @@ module ActionDispatch
           subdomain  = options.fetch :subdomain, true
           domain     = options[:domain]
 
-          host = ""
+          host = "".dup
           if subdomain == true
             return _host if domain.nil?