support for Rack hijack in request and response

Rack 1.5.0 (protocol version [1,2]) adds support for
hijacking the client socket (removing it from the control
of unicorn (or any other Rack webserver)).

Tested with rack 1.5.0.

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index aa98aeb..2d8e4e1 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -559,8 +559,10 @@ class Unicorn::HttpServer
     @request.headers? or headers = nil
     http_response_write(client, status, headers, body,
                         @request.response_start_sent)
-    client.shutdown # in case of fork() in Rack app
-    client.close # flush and uncork socket immediately, no keepalive
+    unless client.closed? # rack.hijack may've close this for us
+      client.shutdown # in case of fork() in Rack app
+      client.close # flush and uncork socket immediately, no keepalive
+    end
   rescue => e
     handle_error(client, e)
   end