1 files changed, 60 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/head.rb b/actionpack/lib/action_controller/metal/head.rb
new file mode 100644
index 0000000000..3c84bebb85
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/head.rb
@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+module ActionController
+  module Head
+    # Returns a response that has no content (merely headers). The options
+    # argument is interpreted to be a hash of header names and values.
+    # This allows you to easily return a response that consists only of
+    # significant headers:
+    #
+    #   head :created, location: person_path(@person)
+    #
+    #   head :created, location: @person
+    #
+    # It can also be used to return exceptional conditions:
+    #
+    #   return head(:method_not_allowed) unless request.post?
+    #   return head(:bad_request) unless valid_request?
+    #   render
+    #
+    # See Rack::Utils::SYMBOL_TO_STATUS_CODE for a full list of valid +status+ symbols.
+    def head(status, options = {})
+      if status.is_a?(Hash)
+        raise ArgumentError, "#{status.inspect} is not a valid value for `status`."
+      end
+
+      status ||= :ok
+
+      location = options.delete(:location)
+      content_type = options.delete(:content_type)
+
+      options.each do |key, value|
+        headers[key.to_s.dasherize.split("-").each { |v| v[0] = v[0].chr.upcase }.join("-")] = value.to_s
+      end
+
+      self.status = status
+      self.location = url_for(location) if location
+
+      self.response_body = ""
+
+      if include_content?(response_code)
+        self.content_type = content_type || (Mime[formats.first] if formats) || Mime[:html]
+        response.charset = false
+      end
+
+      true
+    end
+
+    private
+      def include_content?(status)
+        case status
+        when 100..199
+          false
+        when 204, 205, 304
+          false
+        else
+          true
+        end
+      end
+  end
+end