type: Type of progress to display: either number of bytes uploaded or downloaded.
con: Connection to send output too. Usually stdout() or stderr.
Examples
cap_speed <- config(max_recv_speed_large =10000)## Not run:# If file size is known, you get a progress bar:x <- GET("http://httpbin.org/bytes/102400", progress(), cap_speed)# Otherwise you get the number of bytes downloaded:x <- GET("http://httpbin.org/stream-bytes/102400", progress(), cap_speed)## End(Not run)