c.Transport.(*Transport).DisableKeepAlives = tc.disableKeepAlives
				req, err := NewRequest("GET", ts.URL, nil)
				if err != nil {
					t.Fatal(err)
				}
				count := 0
				trace := &httptrace.ClientTrace{
					WroteHeaderField: func(key string, field []string) {
						if key != "Connection" {
							return
						}
						if httpguts.HeaderValuesContainsToken(field, "close") {
							count += 1
						}

				}
				return false
			}
			return true
		})
		conns := 0
		var info httptrace.GotConnInfo
		ctx := httptrace.WithClientTrace(context.Background(), &httptrace.ClientTrace{
			GotConn: func(v httptrace.GotConnInfo) {
				conns++
				info = v
			},
		})
		req, err := NewRequestWithContext(ctx, "GET", cst.ts.URL, nil)
		if err != nil {
			t.Fatal(err)
		}