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A general description is here.
(C-level Native routine registration.) The undocumented ‘styles’ field of the components of ‘R_CMethodDef’ and ‘R_FortranMethodDef’ is deprecated.
Changes when redirection of a ‘http://’ URL to a ‘https://’ URL is encountered:
• The internal methods of ‘download.file()’ and ‘url()’ now report that they cannot follow this (rather than failing silently).
• (Unix-alike) ‘download.file(method = "auto")’ (the default) re-tries with ‘method = "libcurl"’.
• (Unix-alike) ‘url(method = "default")’ with an explicit ‘open’ argument re-tries with ‘method = "libcurl"’. This covers many of the usages, e.g. ‘readLines()’ with a URL argument.