is_working_gutenberg_mirror: Check if a URL resolves to a working Gutenberg mirror
Description
Checks for a root level README file at url with reference to
GUTINDEX.ALL. If this exists, url is most likely a working
Gutenberg mirror.
Usage
is_working_gutenberg_mirror(url)
Value
Boolean: whether the url resolves to a mirror.
Arguments
- url
An http(s) or ftp(s) URL to check.