Reuse the same HTTP client for all requests. #130
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* create a client.Downloader wrapper around http.Client * don't pass around the proxyServer URL
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Before: Almost every HTTP GET request went through client.Get, which created a new http.Transport (inside of http.DefaultClient) for each request. The code in verify.Command created its own http.Client separately from client.Get.
After: googet creates a single http.Client via NewDownloader, which is reused for all requests, per https://pkg.go.dev/net/http#hdr-Clients_and_Transports. The downloader is passed through to anything that needs it (in place of the proxyServer URL that was formerly being passed around). verify.Command uses this same downloader.