Convert header values into strings.

Author: ioquatix

lib/protocol/rack/adapter/generic.rb

@@ -76,7 +76,7 @@ def unwrap_headers(headers, env)
 								env[http_key] = "#{current_value},#{value}"
 							end
 						else
-							env[http_key] = value
+							env[http_key] = value.to_s
 						end
 					end
 				end