/usr/lib/R/site-library/curl/INDEX is in r-cran-curl 2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 | curl                    Curl connection interface
curl_download           Download file to disk
curl_escape             URL encoding
curl_fetch_memory       Fetch the contents of a URL
curl_options            List curl version and options.
form_file               Upload files with form
handle                  Create and configure a curl handle
handle_cookies          Extract cookies from a handle
ie_proxy                Internet Explorer proxy settings
multi                   Async Multi Download
nslookup                Lookup a hostname
parse_date              Parse date/time
parse_headers           Parse response headers
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