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A general description is here.
Add lengths() function for getting the length of every element in a list
(Windows.) The DLLs ‘internet.dll’ and ‘internet2.dll’ have been merged. In this version it is safe to switch (repeatedly) between the internal and Windows internet functions within an R session.
The Windows internet functions are still selected by flag ‘--internet2’ or ‘setInternet2()’. This can be overridden for an ‘url()’ connection _via_ its new ‘method’ argument.
‘download.file()’ has new method ‘"wininet"’, selected as the default by ‘--internet2’ or ‘setInternet2()’.
Subclass information is kept consistent when replacing an ordinary S4 class with an "old class" via the ‘S4Class’ argument to ‘setOldClass()’. Thus, for example, a ‘data.frame’ is valid for a ‘list’ argument in the signature, and a ‘factor’ is valid for ‘vector’ arguments.
(Windows.) ‘download.file(cacheOK = FALSE)’ is now supported when ‘internet2.dll’ is used.