- message: value must be set when operation is UPSERT
                                rule: '((has(self.operation) ? self.operation : '''')
                                  == ''UPSERT'') ? self.value != '''' : true'
                              - message: value must not be set when operation is REMOVE

    // Make sure this connection is healthy & eligible for new exchanges. If it's no longer needed
    // then we're on the hook to close it.
    val healthy = candidate.isHealthy(connectionUser.doExtensiveHealthChecks())
    var noNewExchangesEvent = false
    val toClose: Socket? =
      candidate.withLock {
        when {
          !healthy -> {
            noNewExchangesEvent = !candidate.noNewExchanges

With that you can connect the WebSocket and then send and receive messages:

<img src="/img/tutorial/websockets/image05.png">

## Handling disconnections and multiple clients

When a WebSocket connection is closed, the `await websocket.receive_text()` will raise a `WebSocketDisconnect` exception, which you can then catch and handle like in this example.

=== "Python 3.9+"

  // The list ordering isn't significant, may contain duplicates, and possibly be incomplete.
  repeated NonResourceRule nonResourceRules = 2;

  // Incomplete is true when the rules returned by this call are incomplete. This is most commonly
  // encountered when an authorizer, such as an external authorizer, doesn't support rules evaluation.
  optional bool incomplete = 3;

            // treated as a property read.
            return resolveCall(parentBinaryExpression)
        }

        if (psi is KtCallableReferenceExpression) {
            return resolveCall(psi.callableReference)
        }

        when (unwrappedPsi) {
            is KtBinaryExpression -> {

  @Throws(IOException::class)
  internal fun checkOutNotClosed() {
    when {
      sink.closed -> throw IOException("stream closed")
      sink.finished -> throw IOException("stream finished")
      errorCode != null -> throw errorException ?: StreamResetException(errorCode!!)
    }
  }

  /**
   * Like [Object.wait], but throws an [InterruptedIOException] when interrupted instead of the more
   * awkward [InterruptedException].

# 2. IMAGE: Node image used by KinD (optional)
# 3. CONFIG: KinD cluster configuration YAML file. If not specified then DEFAULT_CLUSTER_YAML is used
# 4. NOMETALBINSTALL: Dont install matllb if set.
# This function returns 0 when everything goes well, or 1 otherwise
# If Kind cluster was already created then it would be cleaned up in case of errors
function setup_kind_cluster() {
  local NAME="${1:-istio-testing}"

    Because we are using a relative URL, if your API was located at `https://example.com/`, then it would refer to `https://example.com/token`. But if your API was located at `https://example.com/api/v1/`, then it would refer to `https://example.com/api/v1/token`.

  // The list ordering isn't significant, may contain duplicates, and possibly be incomplete.
  repeated NonResourceRule nonResourceRules = 2;

  // Incomplete is true when the rules returned by this call are incomplete. This is most commonly
  // encountered when an authorizer, such as an external authorizer, doesn't support rules evaluation.
  optional bool incomplete = 3;

// gradients available initially).
//
// Then we repeatedly pop an entry from the stack, run its backprop, and update
// the gradients of its inputs. Once we have computed all gradients for a single
// input we can mark this input as done, and this can trigger adding an entry to
// the stack if all outputs of that entry are now done.
//
// When the stack is empty we have gradients for all tensors we're interested
// in.