diff --git a/lib/rack/chrome_frame.rb b/lib/rack/chrome_frame.rb
index 1875bcb1f5029837e06d9e0d12e5a826d4f271a7..81f438d6d594f17850e1a98313b3d34fb276f8a9 100644
--- a/lib/rack/chrome_frame.rb
+++ b/lib/rack/chrome_frame.rb
@@ -17,7 +17,7 @@ module Rack
status, headers, response = @app.call(env)
new_body = insert_tag(build_response_body(response))
new_headers = recalculate_body_length(headers, new_body)
- return [status, new_headers, new_body]
+ return [status, new_headers, [new_body]]
elsif @options[:minimum].nil? or ie_version(env['HTTP_USER_AGENT']) < @options[:minimum]
html = <<-HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
@@ -42,6 +42,10 @@ module Rack
def build_response_body(response)
response_body = ""
response.each { |part| response_body += part }
+
+ # see: http://johnbintz.github.com/blog/2012/03/05/closing-given-body-in-rack-middleware/
+ response.close if response.respond_to?(:close)
+
response_body
end