some issues with fetching data

[Piy]

hi All,

data []

chunk contains   <Fluent::MemoryBufferChunk:0x007f1480c44488>

data << [chunk]

data is [[#<Fluent::MemoryBufferChunk:0x007f1480c44488 @data="{\"id\":\"4cb96d2c-203a-4d96-8fad-43a7b6ca6eec\"}\n", @unique_id="O\xED\xB4\xD3\xED\xC6\x964\xFB\xD5\xFF\xAE\\G\x88\xAF", @mon_owner=#<Thread:0x007f148135b460 run>, @mon_count=1, @mon_mutex=#<Mutex:0x007f1480c68360>, @key="">]]

I want to post 

{\"id\":\"4cb96d2c-203a-4d96-8fad-43a7b6ca6eec\"}  

How can it be done?