Handles Content-Type strings that already contain parameters correctly in

`content_type` (example: `content_type "text/plain; charset=utf-16"`).

CHANGES

@@ -36,6 +36,10 @@
  * URIs passed to the `url` helper or `redirect` may now use any schema to be
    identified as absolute URIs, not only `http` or `https`. (Konstantin Haase)
 
+ * Handles `Content-Type` strings that already contain parameters correctly in
+   `content_type` (example: `content_type "text/plain; charset=utf-16"`).
+   (Konstantin Haase)
+
 = 1.2.1 / 2011-03-17
 
  * Use a generated session secret when using `enable :sessions`. (Konstantin

lib/sinatra/base.rb

@@ -181,7 +181,11 @@ module Sinatra
       unless params.include? :charset or settings.add_charset.all? { |p| not p === mime_type }
         params[:charset] = params.delete('charset') || settings.default_encoding
       end
-      mime_type << ";#{params.map { |kv| kv.join('=') }.join(', ')}" unless params.empty?
+      params.delete :charset if mime_type.include? 'charset'
+      unless params.empty?
+        mime_type << (mime_type.include?(';') ? ', ' : ';')
+        mime_type << params.map { |kv| kv.join('=') }.join(', ')
+      end
       response['Content-Type'] = mime_type
     end
 

test/helpers_test.rb

@@ -442,6 +442,28 @@ class HelpersTest < Test::Unit::TestCase
       get '/'
       assert tests_ran
     end
+
+    it 'handles already present params' do
+      mock_app do
+        get '/' do
+          content_type 'foo/bar;level=1', :charset => 'utf-8'
+          'ok'
+        end
+      end
+      get '/'
+      assert_equal 'foo/bar;level=1, charset=utf-8', response['Content-Type']
+    end
+
+    it 'does not add charset if present' do
+      mock_app do
+        get '/' do
+          content_type 'text/plain;charset=utf-16'
+          'ok'
+        end
+      end
+      get '/'
+      assert_equal 'text/plain;charset=utf-16', response['Content-Type']
+    end
   end
 
   describe 'send_file' do