Add a query parameter to the URL. You can do lots of fun stuff with this. As long as the key and the value both return a useful .toString(), you are good to go.
If you pass a value that implements Iterable, then you will get a query parameter added for each value returned by hasNext(). You can also pass a value that is an array[] of somethings and get the same behavior.
@param key
@param value
@return self
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