Hey Ravi,

I'm a bit curious on the copying between buf and conn->master_buffer at the
end of the lib/sendf.c:Curl_read() function!

It clearly unconditionally always duplicate the data it just downloaded to a
second buffer. Why is that needed?

AFAIU, the extra copy is made to allow the code to rewind when too much has
been read off a pipeline for one transfer when a part was actually indended
for the next transfer/handle? If so, can't we fix that code to only keep the
extra buffer when the connection is in fact pipelined?

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