the query portion of the URL, which may optionally include the leading ? character
OptionalmultiValueKeys: Set<string>if provided, a set of keys for which to always treat as a multi-value array, even if there is only one value
the parsed query parameters, as a parameter object
Parse the query portion of a URL string, and return a parameter object for the parsed key/value pairs.
Multiple parameters of the same name will be stored as an array on the returned object.