INSPIRE metadata validator not working on Windows (curl issue)

[eblondel]

When testing the status of online INSPIRE metadata validator service, we get this error:

Error in curl::curl_fetch_memory(url, handle = handle) : 
  Failure when receiving data from the peer

[eblondel]

This seems a Windows-specific issue. A solution is to set-up the CURL_SSL_BACKEND=ssl in the .Renviro file, to switch to OpenSSL.
This can be done easily doing this:

usethis::edit_r_environ()

then set

CURL_SSL_BACKEND=openssl in the file and save it. Restart R.

Checking the ssl version:

curl::curl_version()$ssl_version

It should give "OpenSSL/1.1.1a (Schannel)" instead of "(OpenSSL/1.1.1a) Schannel"