/**
     * Extension header set by OkHttp specifying the timestamp when the cached HTTP response was
     * first received.
     */
    private var receivedResponseMillis = 0L

    /** Etag of the cached response. */
    private var etag: String? = null

    /** Age of the cached response. */
    private var ageSeconds = -1

    /**
     * Returns true if computeFreshnessLifetime used a heuristic. If we used a heuristic to serve a

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        "fe012443-6ba9-4ef2-bb94-b729d2060c78/test123/testw3c.pdf/xl.meta": {"Versions":[{"Type":1,"V2Obj":{"ID":"aGEA/ZUOR4ueRIZsA...

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    assertThat(invalidate.body.string()).isEqualTo("")
    assertThat(get(url).body.string()).isEqualTo("C")
  }

  @Test
  fun etag() {
    val conditionalRequest =
      assertConditionallyCached(
        MockResponse.Builder()
          .addHeader("ETag: v1")
          .build(),
      )
    assertThat(conditionalRequest.headers["If-None-Match"]).isEqualTo("v1")
  }

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      "x-minio-internal-tier-free-versionID": "OWZlZjk5N2QtMjMzZi00N2U3LTlkZmMtNWYxNzc3NzdlZTM2"
    },
    "MetaUsr": {
      "X-Amz-Replication-Status": "COMPLETED",
      "content-type": "application/octet-stream",
      "etag": "8315e643ed6a5d7c9962fc0a8ef9c11f"
    },
...
```

### Metadata for object replication - on target

```
...
  "MetaSys": {
      "x-minio-internal-inline-data": "dHJ1ZQ==",

    postBodyRetransmittedOnFailureRecovery()
  }

  @Test
  fun cacheHit() {
    server.enqueue(
      MockResponse(
        headers =
          headersOf(
            "ETag",
            "v1",
            "Cache-Control",
            "max-age=60",
            "Vary",
            "Accept-Charset",
          ),
        body = "A",
      ),
    )
    client =