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  redirection in \command{wget}, use \code{extra = "--max-redirect=0"}.)
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  redirection in \command{wget}, use \code{extra = "--max-redirect=0"}.)
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  The \code{"wininet"} method supports some redirections but not all.
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  The \code{"wininet"} method supports some redirections but not all.
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  (For method \code{"libcurl"}, messages will quote the endpoint of
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  (For method \code{"libcurl"}, messages will quote the endpoint of
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  redirections.)
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  redirections.)
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  When the file is not found on the server, the \code{"curl"} method will
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  typically download a HTML file stating that and report success. To
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  instead get an error in that case, use argument \code{extra = "-f"}.
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  See \code{\link{url}} for how \samp{file://} URLs are interpreted,
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  See \code{\link{url}} for how \samp{file://} URLs are interpreted,
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  especially on Windows.  The \code{"internal"} and \code{"wininet"}
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  especially on Windows.  The \code{"internal"} and \code{"wininet"}
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  methods do not percent-decode, but the \code{"libcurl"} and
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  methods do not percent-decode, but the \code{"libcurl"} and
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  \code{"curl"} methods do: method \code{"wget"} does not support them.
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  \code{"curl"} methods do: method \code{"wget"} does not support them.
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