writer_thread_*: fix static file response under 1.8

While these models are designed to work with IO.copy_stream
under Ruby 1.9, it should be possible to run them under Ruby
1.8 without returning corrupt responses.  The large file
response test is beefed up to compare SHA1 checksums of
the served file, not just sizes.

1 files changed, 2 insertions, 6 deletions

diff --git a/lib/rainbows/writer_thread_spawn.rb b/lib/rainbows/writer_thread_spawn.rb
index 95a04c0..0a8988f 100644
--- a/lib/rainbows/writer_thread_spawn.rb
+++ b/lib/rainbows/writer_thread_spawn.rb
@@ -88,12 +88,8 @@ module Rainbows
       end
     end
 
-    if IO.respond_to?(:copy_stream)
-      undef_method :write_body
-
-      def write_body(my_sock, body)
-        my_sock.write_body(body)
-      end
+    def write_body(my_sock, body)
+      my_sock.write_body(body)
     end
 
     def process_client(client)