Pretty URLs

Static site generators such as Hugo can be told to generate “pretty” URLs, i.e. URLs that do not end in the file extension .html but that are still resolving to the files with that file extension.

GitHub Pages supports these pretty URLs by default: whether directing the browser to https://lychee.cli.rs/index or to https://lychee.cli.rs/index.html, either URL will resolve to the same page.

To help with locally checking links in such scenarios, where the links lack the .html extension but the files on disk have them, Lychee supports the option --fallback-extensions:

# If a local link without a file extension does not resolve to an existing file or
# directory, let lychee fall back to try again after appending the `.html` or the
# `.htm` file extension, in that order.
lychee --fallback-extensions html,htm