Function quote_plus 

pub fn quote_plus(string: &str, safe: &str) -> String

Like quote, but also encodes ' ' as '+', as required for HTML form values. Port of quote_plus (Python defaults safe to "").

use urlparse_rs::quote_plus;
assert_eq!(quote_plus("/El Niño/", ""), "%2FEl+Ni%C3%B1o%2F");