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Return true if a query is present.
bool has_query() const;
This function returns true if this contains a query. An empty query is distinct from having no query.
assert( url_view( "/sql?id=42&col=name&page-size=20" ).has_query() );
Constant.
Throws nothing.
query = *( pchar / "/" / "?" ) query-param = key [ "=" value ] query-params = [ query-param ] *( "&" query-param )