Introduce `render :body` for render raw content

This is an option for sending a raw content back to browser. Note that
this rendering option will unset the default content type and does not
include "Content-Type" header back in the response.

You should only use this option if you are expecting the "Content-Type"
header to not be set. More information on "Content-Type" header can be
found on RFC 2616, section 7.2.1.

Please see #12374 for more detail.

3 files changed, 16 insertions, 7 deletions

diff --git a/actionpack/lib/abstract_controller/rendering.rb b/actionpack/lib/abstract_controller/rendering.rb
index f24b03ad16..349bbf4ee7 100644
--- a/actionpack/lib/abstract_controller/rendering.rb
+++ b/actionpack/lib/abstract_controller/rendering.rb
@@ -23,7 +23,7 @@ module AbstractController
     def render(*args, &block)
       options = _normalize_render(*args, &block)
       self.response_body = render_to_body(options)
-      _process_format(rendered_format) if rendered_format
+      _process_format(rendered_format, options) if rendered_format
       self.response_body
     end
 
@@ -98,7 +98,7 @@ module AbstractController
 
     # Process the rendered format.
     # :api: private
-    def _process_format(format)
+    def _process_format(format, options = {})
     end
 
     # Normalize args and options.
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index 5c48b4ab98..c9ae1ab388 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -27,14 +27,19 @@ module ActionController
     end
 
     def render_to_body(options = {})
-      super || options[:text].presence || ' '
+      super || options[:body].presence || options[:text].presence || ' '
     end
 
     private
 
-    def _process_format(format)
+    def _process_format(format, options = {})
       super
       self.content_type ||= format.to_s
+
+      if options[:body].present?
+        self.content_type = "none"
+        self.headers.delete "Content-Type"
+      end
     end
 
     # Normalize arguments by catching blocks and setting them on :update.
@@ -46,12 +51,16 @@ module ActionController
 
     # Normalize both text and status options.
     def _normalize_options(options) #:nodoc:
+      if options.key?(:body) && options[:body].respond_to?(:to_text)
+        options[:body] = options[:body].to_text
+      end
+
       if options.key?(:text) && options[:text].respond_to?(:to_text)
         options[:text] = options[:text].to_text
       end
 
-      if options.delete(:nothing) || (options.key?(:text) && options[:text].nil?)
-        options[:text] = " "
+      if options.delete(:nothing) || (options.key?(:body) && options[:body].nil?) || (options.key?(:text) && options[:text].nil?)
+        options[:body] = " "
       end
 
       if options[:status]
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 2c6bcf7b7b..15a177aaff 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -288,7 +288,7 @@ module ActionDispatch # :nodoc:
     end
 
     def assign_default_content_type_and_charset!(headers)
-      return if headers[CONTENT_TYPE].present?
+      return if headers[CONTENT_TYPE].present? || @content_type == "none"
 
       @content_type ||= Mime::HTML
       @charset      ||= self.class.default_charset unless @charset == false