1 files changed, 12 insertions, 1 deletions
diff --git a/lib/rack/chunked.rb b/lib/rack/chunked.rb
index a400756a..ea221fa9 100644
--- a/lib/rack/chunked.rb
+++ b/lib/rack/chunked.rb
@@ -39,11 +39,22 @@ module Rack
        @app = app
      end
  
+    # pre-HTTP/1.0 (informally "HTTP/0.9") HTTP requests did not have
+    # a version (nor response headers)
+    def chunkable_version?(ver)
+      case ver
+      when "HTTP/1.0", nil, "HTTP/0.9"
+        false
+      else
+        true
+      end
+    end
+
      def call(env)
        status, headers, body = @app.call(env)
        headers = HeaderHash.new(headers)
  
-      if env['HTTP_VERSION'] == 'HTTP/1.0' ||
+      if ! chunkable_version?(env['HTTP_VERSION']) ||
           STATUS_WITH_NO_ENTITY_BODY.include?(status) ||
           headers['Content-Length'] ||
           headers['Transfer-Encoding']