about "connection_pool_size" and "request_pool_size"

[arlene chen]

Hi All,

    who know the exact mean of  "connection_pool_size" and 
"request_pool_size",I  try to find it in  nginx document  but  it it not 
listed in module reference ,and I can not search it in nginx wiki too. 
Finally I search it from  nginx's  source code, only  two xx.c   used 
these parameter , but I can  not find out the exact mean of these two 
parameters, so I need to know  how these two parameters are defined and 
the most thing is they are used for what?

-- 
      best regards,
         arlenecc

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