Merge pull request #178 from andrykonchin/minor-fixes

Minor fixes

lib/rack/contrib/backstage.rb

@@ -12,7 +12,7 @@ def initialize(app, path)
     def call(env)
       if File.exists?(@file)
         content = File.read(@file)
-        length = "".respond_to?(:bytesize) ? content.bytesize.to_s : content.size.to_s
+        length = content.bytesize.to_s
         [503, {'Content-Type' => 'text/html', 'Content-Length' => length}, [content]]
       else
         @app.call(env)

lib/rack/contrib/jsonp.rb

@@ -55,7 +55,7 @@ def call(env)
 
         # Set new Content-Length, if it was set before we mutated the response body
         if headers['Content-Length']
-          length = response.to_ary.inject(0) { |len, part| len + part.bytesize }
+          length = response.map(&:bytesize).reduce(0, :+)
           headers['Content-Length'] = length.to_s
         end
       end

lib/rack/contrib/mailexceptions.rb

@@ -106,7 +106,7 @@ def send_notification(exception, env)
 
     def extract_body(env)
       if io = env['rack.input']
-        io.rewind if io.respond_to?(:rewind)
+        io.rewind
         io.read
       end
     end

lib/rack/contrib/nested_params.rb

@@ -26,7 +26,7 @@ def call(env)
         post_body = env[POST_BODY]
         env[FORM_INPUT] = post_body
         env[FORM_HASH] = Rack::Utils.parse_nested_query(post_body.read)
-        post_body.rewind if post_body.respond_to?(:rewind)
+        post_body.rewind
       end
       @app.call(env)
     end

lib/rack/contrib/signals.rb

@@ -26,6 +26,10 @@ def each(&block)
         @body.each(&block)
         @callback.call
       end
+
+      def close
+        @body.close if @body.respond_to?(:close)
+      end
     end
 
     def initialize(app, &block)