The result will be discarded.

### Typed handlers

Typed handlers are handlers that have a specific type for the request and response payloads.
These must provide `msgp` serialization and deserialization.

In the examples we use a `MSS` type, which is a `map[string]string` that is `msgp` serializable.

```go
    handler := func(request *grid.MSS) (*grid.MSS, *grid.RemoteErr) {

Construction should create informers (via `kclient.New`), setup a queue (via `controllers.NewQueue`), and register event handlers on the informers.
Often, these handlers are adding something to the queue like `client.AddEventHandler(controllers.ObjectHandler(queue.AddObject))`.
Construction should NOT actually start running all of these things, do I/O, or block in anyway.

In most cases, the same tool that is used to **run the program on startup** is also used to handle automatic **restarts**.

For example, this could be handled by:

* Docker
* Kubernetes
* Docker Compose
* Docker in Swarm Mode
* Systemd
* Supervisor
* Handled internally by a cloud provider as part of their services
* Others...

## Replication - Processes and Memory

    opt raise
        dep -->> handler: Raise HTTPException
        handler -->> client: HTTP error response
        dep -->> dep: Raise other exception
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise HTTPException
        dep -->> handler: Auto forward exception
        handler -->> client: HTTP error response

## Accessing the request body in an exception handler

!!! tip
    To solve this same problem, it's probably a lot easier to use the `body` in a custom handler for `RequestValidationError` ([Handling Errors](../tutorial/handling-errors.md#use-the-requestvalidationerror-body){.internal-link target=_blank}).

`Make[T]` function, which produces a reference to a canonical copy of
the value in the form of a `Handle[T]`.
Two `Handle[T]` are equal if and only if the values used to produce the
handles are equal, allowing programs to deduplicate values and reduce
their memory footprint.
Comparing two `Handle[T]` values is efficient, reducing down to a simple

            activeLogger.level = Level.FINE
            handler.level = Level.FINE
            handler.formatter = MessageFormatter
            activeLogger.addHandler(handler)
          }

          if (sslDebug) {
            val activeLogger = getLogger("javax.net.ssl")

            activeLogger.level = Level.FINEST
            handler.level = Level.FINEST
            handler.formatter = MessageFormatter

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import java.io.Closeable
import java.util.logging.Handler
import java.util.logging.LogRecord

object JsseDebugLogging {
  data class JsseDebugMessage(val message: String, val param: String?) {
    enum class Type {
      Handshake,
      Plaintext,
      Encrypted,

@file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE", "Since15")

package okhttp3.recipes.kt

import java.io.File
import java.io.IOException
import java.lang.ProcessBuilder.Redirect
import java.util.logging.Handler
import java.util.logging.Level
import java.util.logging.LogRecord
import java.util.logging.Logger
import javax.crypto.SecretKey
import javax.net.ssl.SSLSession
import javax.net.ssl.SSLSocket
import okhttp3.Call

 * limitations under the License.
 */
package mockwebserver3

import mockwebserver3.SocketPolicy.KeepOpen
import okhttp3.ExperimentalOkHttpApi

/** Handler for mock server requests. */
@ExperimentalOkHttpApi
abstract class Dispatcher {
  /**
   * Returns a response to satisfy `request`. This method may block (for instance, to wait on
   * a CountdownLatch).
   */