Encode and decode URL parameters
Converts special characters to percent-encoding.
Example: привет мир → %D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D1%82%20%D0%BC%D0%B8%D1%80
привет мир
%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D1%82%20%D0%BC%D0%B8%D1%80