Fixed: ngx_http_read_client_request_body returned unexpected buffer type

- after post request is processed
the calling to ngx_http_read_client_request_body will ingore
r->request_body_in_file_only option, which is not expected.
read client body in a better manner
Added cleanup handler for finalize request
Fixed request body is larger
Revert "Fixed request body is larger"

This reverts commit ee47cccb63588fef6294351abdf07e7b914404d9.
Fixed 'request body is larger ...' error
Merge pull request #22 from chaizhenhua/read_client_request_body

Fixed: ngx_http_read_client_request_body returned unexpected buffer type