5 files changed, 39 insertions, 24 deletions
diff --git a/actionpack/lib/action_dispatch/http/mime_negotiation.rb b/actionpack/lib/action_dispatch/http/mime_negotiation.rb
index 7acf91902d..0152c17ed4 100644
--- a/actionpack/lib/action_dispatch/http/mime_negotiation.rb
+++ b/actionpack/lib/action_dispatch/http/mime_negotiation.rb
@@ -67,6 +67,8 @@ module ActionDispatch
 
           v = if params_readable
             Array(Mime[parameters[:format]])
+          elsif format = format_from_path_extension
+            Array(Mime[format])
           elsif use_accept_header && valid_accept_header
             accepts
           elsif xhr?
@@ -160,6 +162,13 @@ module ActionDispatch
       def use_accept_header
         !self.class.ignore_accept_header
       end
+
+      def format_from_path_extension
+        path = @env['action_dispatch.original_path'] || @env['PATH_INFO']
+        if match = path && path.match(/\.(\w+)\z/)
+          match.captures.first
+        end
+      end
     end
   end
 end
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index b64f660ec5..b8d395854c 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -47,15 +47,10 @@ module Mime
     def const_missing(sym)
       ext = sym.downcase
       if Mime[ext]
-        ActiveSupport::Deprecation.warn <<-eow
-Accessing mime types via constants is deprecated.  Please change:
-
-  `Mime::#{sym}`
-
-to:
-
-  `Mime[:#{ext}]`
-        eow
+        ActiveSupport::Deprecation.warn(<<-MSG.squish)
+          Accessing mime types via constants is deprecated.
+          Please change `Mime::#{sym}` to `Mime[:#{ext}]`.
+        MSG
         Mime[ext]
       else
         super
@@ -65,15 +60,10 @@ to:
     def const_defined?(sym, inherit = true)
       ext = sym.downcase
       if Mime[ext]
-        ActiveSupport::Deprecation.warn <<-eow
-Accessing mime types via constants is deprecated.  Please change:
-
-  `Mime.const_defined?(#{sym})`
-
-to:
-
-  `Mime[:#{ext}]`
-        eow
+        ActiveSupport::Deprecation.warn(<<-MSG.squish)
+          Accessing mime types via constants is deprecated.
+          Please change `Mime.const_defined?(#{sym})` to `Mime[:#{ext}]`.
+        MSG
         true
       else
         super
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index ea61ad0c02..29cf821090 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -36,8 +36,8 @@ module ActionDispatch
         HTTP_ACCEPT HTTP_ACCEPT_CHARSET HTTP_ACCEPT_ENCODING
         HTTP_ACCEPT_LANGUAGE HTTP_CACHE_CONTROL HTTP_FROM
         HTTP_NEGOTIATE HTTP_PRAGMA HTTP_CLIENT_IP
-        HTTP_X_FORWARDED_FOR HTTP_VERSION
-        HTTP_X_REQUEST_ID HTTP_X_FORWARDED_HOST
+        HTTP_X_FORWARDED_FOR HTTP_ORIGIN HTTP_VERSION
+        HTTP_X_CSRF_TOKEN HTTP_X_REQUEST_ID HTTP_X_FORWARDED_HOST
         SERVER_ADDR
         ].freeze
 
@@ -49,6 +49,10 @@ module ActionDispatch
       METHOD
     end
 
+    def self.empty
+      new({})
+    end
+
     def initialize(env)
       super
       @method            = nil
@@ -59,6 +63,9 @@ module ActionDispatch
       @ip                = nil
     end
 
+    def commit_cookie_jar! # :nodoc:
+    end
+
     def check_path_parameters!
       # If any of the path parameters has an invalid encoding then
       # raise since it's likely to trigger errors further on.
@@ -306,10 +313,16 @@ module ActionDispatch
       end
     end
 
-    # Returns true if the request's content MIME type is
-    # +application/x-www-form-urlencoded+ or +multipart/form-data+.
+    # Determine whether the request body contains form-data by checking
+    # the request Content-Type for one of the media-types:
+    # "application/x-www-form-urlencoded" or "multipart/form-data". The
+    # list of form-data media types can be modified through the
+    # +FORM_DATA_MEDIA_TYPES+ array.
+    #
+    # A request body is not assumed to contain form-data when no
+    # Content-Type header is provided and the request_method is POST.
     def form_data?
-      FORM_DATA_MEDIA_TYPES.include?(content_mime_type.to_s)
+      FORM_DATA_MEDIA_TYPES.include?(media_type)
     end
 
     def body_stream #:nodoc:
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index f0127aa276..9b11111a67 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -412,6 +412,8 @@ module ActionDispatch # :nodoc:
     end
 
     def before_sending
+      headers.freeze
+      request.commit_cookie_jar! unless committed?
     end
 
     def build_buffer(response, body)
diff --git a/actionpack/lib/action_dispatch/http/url.rb b/actionpack/lib/action_dispatch/http/url.rb
index 92b10b6d3b..37f41ae988 100644
--- a/actionpack/lib/action_dispatch/http/url.rb
+++ b/actionpack/lib/action_dispatch/http/url.rb
@@ -81,7 +81,8 @@ module ActionDispatch
         def add_params(path, params)
           params = { params: params } unless params.is_a?(Hash)
           params.reject! { |_,v| v.to_param.nil? }
-          path << "?#{params.to_query}" unless params.empty?
+          query = params.to_query
+          path << "?#{query}" unless query.empty?
         end
 
         def add_anchor(path, anchor)