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-rw-r--r--lib/rainbows/ev_core.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/rainbows/ev_core.rb b/lib/rainbows/ev_core.rb
index f61b33f..2a064dd 100644
--- a/lib/rainbows/ev_core.rb
+++ b/lib/rainbows/ev_core.rb
@@ -8,6 +8,9 @@ module Rainbows
     include Rainbows::Const
     G = Rainbows::G
 
+    # Apps may return this Rack response: AsyncResponse = [ -1, {}, [] ]
+    ASYNC_CALLBACK = "async.callback".freeze
+
     def self.setup(klass)
       klass.const_set(:APP, G.server.app)
     end