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        import urllib3

        proxy = urllib3.ProxyManager("https://localhost:3128/")

        resp1 = proxy.request("GET", "https://google.com/")
        resp2 = proxy.request("GET", "https://httpbin.org/")

        print(len(proxy.pools))
        # 1

        resp3 = proxy.request("GET", "https://httpbin.org/")
        resp4 = proxy.request("GET", "https://twitter.com/")

        print(len(proxy.pools))
        # 3

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