R-curl

The curl() and curl_download() functions provide configurable
drop-in replacements for base url() and download.file() with better
performance, support for encryption (https, ftps), gzip compression,
authentication, and other 'libcurl' goodies. The core of the package
implements a framework for performing customized requests where data
can be processed either in memory, on disk, or streaming via the callback
or connection interfaces. Some knowledge of 'libcurl' is recommended; for
a more-user-friendly web client, see the 'httr' package which builds on
this package with http specific tools and logic.

          

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License: MIT
URL: http://cran.r-project.org/web/packages/curl