rack: expose "rainbows.model" in Rack environment

This allows applications to determine which concurrency model
they're running under and possibly make adjustments accordingly.
The standard "rack.multithread" isn't enough for some
applications to determine what to do, especially when reentrancy
is required/recommended.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/rainbows/http_server.rb b/lib/rainbows/http_server.rb
index 0d9ef35..fc51ac3 100644
--- a/lib/rainbows/http_server.rb
+++ b/lib/rainbows/http_server.rb
@@ -31,7 +31,7 @@ module Rainbows
       Module === mod or
         raise ArgumentError, "concurrency model #{model.inspect} not supported"
       extend(mod)
-      @use = model
+      Const::RACK_DEFAULTS['rainbows.model'] = @use = model
     end
 
     def worker_connections(*args)