Which Variable Holds The Url As Value ?

Adv Php Guys,
The following is Php-Proxy. If I were to add a tracker, then which variable’s value should I record ? I mean, which variable would hold the url value. The url the proxy about to fetch.
Any ideas ?

[url]https://github.com/joshdick/miniProxy[/url]

Code is too long to list here. Forum disallows it.

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