### Required, can be `None` { #required-can-be-none }

You can declare that a parameter can accept `None`, but that it's still required. This would force clients to send a value, even if the value is `None`.

To do that, you can declare that `None` is a valid type but simply do not declare a default value:

{* ../../docs_src/query_params_str_validations/tutorial006c_an_py310.py hl[9] *}

    @Override
    public void close() {}

    @Override
    public String toString() {
      return "CharStreams.nullWriter()";
    }
  }

  /**
   * Returns a Writer that sends all output to the given {@link Appendable} target. Closing the
   * writer will close the target if it is {@link Closeable}, and flushing the writer will flush the
   * target if it is {@link java.io.Flushable}.
   *

      // This guarantees a deterministic sequence when handling the canceled request:
      // 1. Server reads request and dequeues first response
      // 2. Client cancels request
      // 3. Server tries to send response on the canceled stream
      // Otherwise, there is no guarantee for the sequence. For example, the server may use the
      // first mocked response to respond to the second request.

	},
	cli.StringFlag{
		Name:   "memlimit",
		Usage:  "set global memory limit per server via GOMEMLIMIT",
		Hidden: true,
		EnvVar: "MINIO_MEMLIMIT",
	},
	cli.IntFlag{
		Name:   "send-buf-size",
		Value:  4 * humanize.MiByte,
		EnvVar: "MINIO_SEND_BUF_SIZE",
		Hidden: true,
	},
	cli.IntFlag{
		Name:   "recv-buf-size",
		Value:  4 * humanize.MiByte,
		EnvVar: "MINIO_RECV_BUF_SIZE",

    private final String toString;

    protected Stimulus(String toString) {
      this.toString = toString;
    }

    /**
     * Send this stimulus to both iterators and return normally only if both produce the same
     * response.
     */
    abstract void executeAndCompare(ListIterator<E> reference, T target);

    @Override

	var replicateILMExpiry bool
	for _, site := range info.Sites {
		if site.ReplicateILMExpiry {
			replicateILMExpiry = true
			break
		}
	}
	if !replicateILMExpiry {
		// explicitly send nil for ILMExpiryStats
		info.ILMExpiryStats = nil
	}

	if err = json.NewEncoder(w).Encode(info); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}
}

by the browser at the URL `https://minio-node-1.example.org`, the redirect URL will be `https://minio-node-1.example.org/oauth_callback` and all is well.

For deployments with a load-balancer (LB), it is required that the LB is configured to send requests from the same user/client-app to the same backend MinIO server (at least for the initial login request and subsequent redirection, as the OpenID auth flow's state parameter is currently local to the MinIO server). For this setup, set the ...

		}
		buf.WriteString(s3Select.Output.JSONArgs.RecordDelimiter)

		return nil
	}

	panic(fmt.Errorf("unknown output format '%v'", s3Select.Output.format))
}

// Evaluate - filters and sends records read from opened reader as per select statement to http response writer.
func (s3Select *S3Select) Evaluate(w http.ResponseWriter) {
	getProgressFunc := s3Select.getProgress
	if !s3Select.Progress.Enabled {

	}
}

// WriteOnCloser implements io.WriteCloser and always
// executes at least one write operation if it is closed.
//
// This can be useful within the context of HTTP. At least
// one write operation must happen to send the HTTP headers
// to the peer.
type WriteOnCloser struct {
	io.Writer
	hasWritten bool
}

func (w *WriteOnCloser) Write(p []byte) (int, error) {
	w.hasWritten = true
	return w.Writer.Write(p)
}

    call: Call,
    request: Request,
  ) {
  }

  /**
   * Invoked just prior to sending a request body.  Will only be invoked for request allowing and
   * having a request body to send.
   *
   * The connection is implicit, and will generally relate to the last [connectionAcquired] event.
   *
   * This can be invoked more than 1 time for a single [Call]. For example, if the response to the