[rabbitmq-discuss] shovel Plug-in problem ! (How to configure headers items)

[何大紅]

Like rabbits friends Hello everybody!
 I came to China, my English is very poor, do not mind :)

I would like to ask a question about the use of plug-shovel,
This plug-in has the following configuration fragment content:
-----------------------------------------------
......
{publish_properties, [
       {headers, [ {<< "key1" >>, long, 60000}
                       ,{<< "key2" >>,?, << "there is string content" >>}]
       }
]}
......

I hope that when sending a message shovel plugin to attach some header 
information of each message, as key1 and key2(If only key1 test no 
problem), but key2 is a string, the above "?" At what should I write? I 
tried to write "string", but wrong. I searched the official documents, but 
could not find how to write, I do not know erlang Language: (

I think this should be a shovel plugin configuration file syntax problem, 
you can tell that I should！

Thank you very much！
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