The function returns a data frame with one row for each downloaded file and
the following columns:
success
if the HTTP request was successfully performed, regardless of the
response status code. This is FALSE
in case of a network error, or in case
you tried to resume from a server that did not support this. A value of NA
means the download was interrupted while in progress.
status_code
the HTTP status code from the request. A successful download is
usually 200
for full requests or 206
for resumed requests. Anything else
could indicate that the downloaded file contains an error page instead of the
requested content.
resumefrom
the file size before the request, in case a download was resumed.
url
final url (after redirects) of the request.
destfile
downloaded file on disk.
error
if success == FALSE
this column contains an error message.
type
the Content-Type
response header value.
modified
the Last-Modified
response header value.
time
total elapsed download time for this file in seconds.
headers
vector with http response headers for the request.