URI.encode_www_form
You're seeing just the function
encode_www_form
, go back to URI module for more information.
Specs
Encodes string
as "x-www-form-urlencoded".
Note "x-www-form-urlencoded" is not specified as part of RFC 3986. However, it is a commonly used format to encode query strings and form data by browsers.
Example
iex> URI.encode_www_form("put: it+й")
"put%3A+it%2B%D0%B9"