pub const URL_EXTENSION: &str = "url.extension";
The file extension extracted from the url.full, excluding the leading dot.
url.full
The file extension is only set if it exists, as not every url has a file extension. When the file name has multiple extensions example.tar.gz, only the last one should be captured gz, not tar.gz.
example.tar.gz
gz
tar.gz
"png"
"gz"