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  \item{reserved}{should reserved characters be encoded?  See
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  \item{reserved}{should reserved characters be encoded?  See
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    \sQuote{Details}.}
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    \sQuote{Details}.}
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}
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}
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\details{
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\details{
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  Characters in a URL other than the English alphanumeric characters and
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  Characters in a URL other than the English alphanumeric characters and
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  \samp{$ - _ . + ! * ' ( ) ,} should be encoded as \code{\%}
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  \samp{- _ . ~} should be encoded as \code{\%}
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  plus a two-digit hexadecimal representation, and any single-byte
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  plus a two-digit hexadecimal representation, and any single-byte
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  character can be so encoded. (Multi-byte characters are encoded as
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  character can be so encoded. (Multi-byte characters are encoded as
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  byte-by-byte.)
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  byte-by-byte.)
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  In addition, \samp{; / ? : @ = &} are reserved characters, and should
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  In addition, \samp{! $ & ' ( ) * + , ; = : / ? @ # [ ]} are reserved
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  be encoded unless used in their reserved sense, which is scheme
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  characters, and should be encoded unless used in their reserved sense,
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  specific.  The default in \code{URLencode} is to leave them alone, which
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  which is scheme specific.  The default in \code{URLencode} is to leave
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  is appropriate for \samp{file://} URLs, but probably not for
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  them alone, which is appropriate for \samp{file://} URLs, but probably
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  \samp{http://} ones.
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  not for \samp{http://} ones.
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}
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}
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\value{
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\value{
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  A character string.
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  A character string.
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}
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}
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\references{
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\references{
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  RFC1738, \url{http://www.rfc-editor.org/rfc/rfc1738.txt}
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  RFC 3986 \url{http://tools.ietf.org/html/rfc3986}
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}
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}
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\examples{
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\examples{
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(y <- URLencode("a url with spaces and / and @"))
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(y <- URLencode("a url with spaces and / and @"))
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URLdecode(y)
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URLdecode(y)
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(y <- URLencode("a url with spaces and / and @", reserved = TRUE))
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(y <- URLencode("a url with spaces and / and @", reserved = TRUE))