Proxy: http.ProxyFromEnvironment,
			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
				return &fakeConn{err: expectedErr}, nil
			},
			MaxIdleConns:          100,
			IdleConnTimeout:       90 * time.Second,
			TLSHandshakeTimeout:   10 * time.Second,
			ExpectContinueTimeout: 1 * time.Second,
		}
		responder = &fakeResponder{t: t, w: w}
		proxyHandler := NewUpgradeAwareHandler(
			&url.URL{

		{"Transport.DisableKeepAlives", Field, 0},
		{"Transport.ExpectContinueTimeout", Field, 6},
		{"Transport.ForceAttemptHTTP2", Field, 13},
		{"Transport.GetProxyConnectHeader", Field, 16},
		{"Transport.IdleConnTimeout", Field, 7},
		{"Transport.MaxConnsPerHost", Field, 11},
		{"Transport.MaxIdleConns", Field, 7},
		{"Transport.MaxIdleConnsPerHost", Field, 0},
		{"Transport.MaxResponseHeaderBytes", Field, 7},