* first initiated.
     */
    private var sentRequestMillis = 0L

    /**
     * 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. */

    assertThat(response.code).isEqualTo(expectedResponseCode)

    // Exhaust the content stream.
    response.body.string()
    val cached = cacheGet(cache, request)
    if (shouldWriteToCache) {
      assertThat(cached).isNotNull()
      cached!!.body.close()
    } else {
      assertThat(cached).isNull()
    }
    server.shutdown() // tearDown() isn't sufficient; this test starts multiple servers
  }

   */
  open fun cacheMiss(call: Call) {
  }

  /**
   * Invoked when a response will be served from the cache or network based on validating the
   * cached Response freshness. Will be followed by cacheHit or cacheMiss after the network
   * Response is available.
   *
   * This event will only be received when a Cache is configured for the client.
   */

      } catch (e: IOException) {
        logger.fine("$this connection from ${raw.inetAddress} failed: $e")
      } catch (e: Exception) {
        logger.log(Level.SEVERE, "$this connection from ${raw.inetAddress} crashed", e)
      }
    }
  }

  internal inner class SocketHandler(private val raw: Socket) {
    private var sequenceNumber = 0

    @Throws(Exception::class)
    fun handle() {

        } catch (_: IOException) {
          // Nothing useful to do here. We failed to remove from the cache. Most likely that's
          // because we couldn't update the journal, but the cached entry will still be gone.
        } finally {
          this.removeSnapshot = null
        }
      }
    }
  }

  /** A snapshot of the values for an entry. */

        .onlyIfCached()
        .noTransform()
        .immutable()
        .build()
    assertThat(cacheControl.toString()).isEqualTo(
      "no-cache, no-store, max-age=1, max-stale=2, min-fresh=3, only-if-cached, no-transform, immutable",
    )
    assertThat(cacheControl.noCache).isTrue()
    assertThat(cacheControl.noStore).isTrue()
    assertThat(cacheControl.maxAgeSeconds).isEqualTo(1)

=== ":material-language-kotlin: Kotlin"
    ```kotlin

      listOf(
        Header(Header.TARGET_METHOD, "GET"),
        Header(Header.TARGET_SCHEME, "https"),
        Header(Header.TARGET_AUTHORITY, "squareup.com"),
        Header(Header.TARGET_PATH, "/cached"),
      )
    peer.sendFrame().pushPromise(3, 2, expectedRequestHeaders)
    val expectedResponseHeaders =
      listOf(
        Header(Header.RESPONSE_STATUS, "200"),
      )

FE48          ; disallowed_STD3_mapped ; 005D          # 4.0  PRESENTATION FORM FOR VERTICAL RIGHT SQUARE BRACKET
FE49..FE4C    ; disallowed_STD3_mapped ; 0020 0305     # 1.1  DASHED OVERLINE..DOUBLE WAVY OVERLINE
FE4D..FE4F    ; disallowed_STD3_mapped ; 005F          # 1.1  DASHED LOW LINE..WAVY LOW LINE
FE50          ; disallowed_STD3_mapped ; 002C          # 1.1  SMALL COMMA

    could use new flow control capacity before acknowledging it, causing strict HTTP/2 servers to
    fail the call.


## Version 4.1.1

_2019-09-05_

 *  Fix: Don't drop repeated headers when validating cached responses. In our Kotlin upgrade we
    introduced a regression where we iterated the number of unique header names rather than then
    number of unique headers. If you're using OkHttp's response cache this may impact you.