Relative to CURL_MAX_WRITE_SIZE it may be interesting to remember our
'ADVISORY: libcurl data callback excessive length'
http://curl.haxx.se/mail/lib-2010-02/0075.html

Maybe it would be interesting to actually keep the amount of data
passed to the write callback limited by CURL_MAX_WRITE_SIZE and for
the header callback by the smaller of CURL_MAX_WRITE_SIZE and
CURL_MAX_HTTP_HEADER.

Or maybe establish some option which allows using app to limit the
amount of data the write and header callbacks may return.

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