diff --git a/lib/reel.rb b/lib/reel.rb
index ea0af18..83626a5 100644
--- a/lib/reel.rb
+++ b/lib/reel.rb
@@ -42,4 +42,12 @@ class UnsupportedMethodError < ArgumentError; end
   # wrong state for a given operation
   class StateError < RuntimeError; end
 
+  # Multipart Parsing Error
+  # :error_code paramter can be used for responding purpose
+  class MultipartParseError < RequestError
+    def initialize error_code
+      @error_code = error_code
+    end
+    attr_reader :error_code
+  end
 end
diff --git a/lib/reel/request/multipart.rb b/lib/reel/request/multipart.rb
index 3a459e3..e8baa8d 100644
--- a/lib/reel/request/multipart.rb
+++ b/lib/reel/request/multipart.rb
@@ -54,8 +54,8 @@ def initialize(body, boundary)
             #TODO : expose part information if needed
           }
         end
-
-        @reader.on_error{|msg| warn msg }
+        # Raising MultipartParseError with error code 400
+        @reader.on_error{|msg| raise MultipartParseError.new(400), msg }
 
       end
 
@@ -67,8 +67,8 @@ def decode
         begin
           @body.each { |chunks| write chunks }
         rescue => e
-          warn e
           @files = {}
+          raise e
         end
         @files
       end
diff --git a/spec/reel/multipart_spec.rb b/spec/reel/multipart_spec.rb
index c522649..3d4a40a 100644
--- a/spec/reel/multipart_spec.rb
+++ b/spec/reel/multipart_spec.rb
@@ -146,15 +146,17 @@
     raise ex if ex
   end
 
-  it "Parsing error for wrong boundary value" do
+  it "MultipartParseError for wrong boundary value" do
       ex = nil
 
       handler = proc do |connection|
         begin
           req = connection.request
-          expect(req.multipart? req.body).to eq true
-          expect(req.multipart.empty?).to eq true
-
+          begin
+            req.multipart
+          rescue => e
+            expect(e.is_a? Reel::MultipartParseError).to eq true
+          end
           req.respond :ok, response_body
         rescue => ex
         end