Return the query
<include/boost/url/url_view_base.hpp>
pct_string_view
encoded_query() const noexcept;
If this contains a query, it is returned as a string (which may be empty). Otherwise, an empty string is returned. The returned string may contain percent escapes.
assert( url_view( "/sql?id=42&name=jane%2Ddoe&page+size=20" ).encoded_query() == "id=42&name=jane%2Ddoe&page+size=20" );
query = *( pchar / "/" / "?" )
query-param = key [ "=" value ]
query-params = [ query-param ] *( "&" query-param )
encoded_params , has_query , params , query .