if body != "Hello world.\n" {
			b.Fatal("Got body:", body)
		}
	}

	b.StopTimer()
}

func BenchmarkClientServerParallel(b *testing.B) {
	for _, parallelism := range []int{4, 64} {
		b.Run(fmt.Sprint(parallelism), func(b *testing.B) {
			run(b, func(b *testing.B, mode testMode) {
				benchmarkClientServerParallel(b, parallelism, mode)
			}, []testMode{http1Mode, https1Mode, http2Mode})
		})

    * PR [#464](https://github.com/tiangolo/fastapi/pull/464) by [@jonathanunderwood](https://github.com/jonathanunderwood).