fix paramter extraction with charset

This fixes a bug where a charset in the content type blocked the
extraction of the payload.
A browser may send a string like

  multipart/form-data; charset=UTF-8

which include? could not find the defined types. Now it gets split and
then checked against the defined types.

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/unit/zero/request/parameter/payload_spec.rb b/spec/unit/zero/request/parameter/payload_spec.rb
index 9cf1198..6f54361 100644
--- a/spec/unit/zero/request/parameter/payload_spec.rb
+++ b/spec/unit/zero/request/parameter/payload_spec.rb
@@ -50,6 +50,16 @@ describe Zero::Request::Parameter, '#payload' do
     its(:payload) { should == {'bar[]' => ['foo', 'bar']} }
   end
 
+  context 'with encoding in the content type' do
+    let(:env) do
+      EnvGenerator.post('/foo', {
+        :input => 'foo=bar',
+        'CONTENT_TYPE' => 'multipart/form-data; charset=UTF-8'
+      })
+    end
+    its(:payload) { should == {'foo' => 'bar'} }
+  end
+
   # TODO behaves like this, but is this really good like this?
   context 'with a post body and content type application/json' do
     let(:env) do