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-rw-r--r--lib/rainbows/server_token.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rainbows/server_token.rb b/lib/rainbows/server_token.rb
index 4098ca7..0ee87ac 100644
--- a/lib/rainbows/server_token.rb
+++ b/lib/rainbows/server_token.rb
@@ -30,7 +30,7 @@ class ServerToken < Struct.new(:app, :token)
 
   def call(env)
     status, headers, body = app.call(env)
-    headers = Rack::Utils::HeaderHash.new(headers)
+    headers = Rack::Utils::HeaderHash.new(headers) unless Hash === headers
     headers[SERVER] = token
     [ status, headers, body ]
   end