Appends one or more values of a parameter to the URL. Checks to see if each value is null, and if so generates a parameter with no value. URL Encodes the parameter values to make sure that it is safe to insert into the URL.
If any parameter value passed is a Collection or an Array then this method is called recursively with the contents of the collection or array. As a result you can pass arbitrarily nested arrays and collections to this method and it will recurse through them adding all scalar values as parameters to the URL.
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