*
 * This class supports [asynchronous canceling][cancel]. This is intended to have the smallest
 * blast radius possible. If an HTTP/2 stream is active, canceling will cancel that stream but not
 * the other streams sharing its connection. But if the TLS handshake is still in progress then
 * canceling may break the entire connection.
 */
class RealCall(
  val client: OkHttpClient,

 *  Fix: Limit retry attempts for HTTP/2 `REFUSED_STREAM` and `CANCEL` failures.
 *  Fix: Retry automatically when incorrectly sharing a connection among multiple hostnames. OkHttp
    shares connections when hosts share both IP addresses and certificates, such as `squareup.com`
    and `www.squareup.com`. If a server refuses such sharing it will return HTTP 421 and OkHttp will
    automatically retry on an unshared connection.

    server.enqueue(MockResponse(body = "A"))
    client =
      client.newBuilder()
        .readTimeout(Duration.ofSeconds(1))
        .build()

    // Make a call expecting a timeout reading the response headers.
    val call1 = client.newCall(Request(server.url("/")))
    assertFailsWith<SocketTimeoutException> {
      call1.execute()
    }.also { expected ->

    setUp(parameters.first, parameters.second)
    cache.maxSize = 8
    taskFaker.runNextTask()
    set("a", "aa", "aa")
    set("b", "bb", "bbb")

    // Cause the cache trim to fail on the second value leaving a partial snapshot.
    filesystem.setFaultyDelete(cacheDir / "a.1", true)
    taskFaker.runNextTask()

    // Confirm the partial snapshot is not returned.
    assertThat(cache["a"]).isNull()