Question on pre-read under 'ngx_http_read_client_request_body'

[Pravin Tatti]

I am beginner to nginx and trying to understand it can any one help to
understand the below query:

In ngx_http_read_client_request_body() there is a pre-read part of the
request body this is basically used to populate the request->body with body
filters right? why we are not doing the same in case of spdy any specific
reason.
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