In this example, the messages will be written to the `log.txt` file *after* the response is sent.

If there was a query in the request, it will be written to the log in a background task.

And then another background task generated at the *path operation function* will write a message using the `email` path parameter.

## Technical Details

    /**
     * Returns the flags currently in use for this message.
     *
     * @return An <code>int</code> containing the flags in use for this
     *         message.
     */
    public int getFlags () {
        return this.flags;
    }


    /**
     * Sets the flags for this message.
     *
     * @param flags
     *            The flags for this message.
     */
    public void setFlags ( int flags ) {

//
// It does not implement the standard error Unwrap interface for
// better error log messages.
type Error struct {
	Code    int    // The HTTP status code returned to the client
	APICode string // The API error code identifying the error
	Err     string // The error message returned to the client
	Cause   error  // Optional, lower level error cause.
}

func (e Error) Error() string {

	go l.cleanupRoutine()
	return l
}

var logOnce = newLogOnceType()

// LogOnceIf - Logs notification errors - once per error.
// id is a unique identifier for related log messages, refer to cmd/notification.go
// on how it is used.
func LogOnceIf(ctx context.Context, subsystem string, err error, id string, errKind ...interface{}) {
	if logIgnoreError(err) {
		return
	}

// Events have a limited retention time and triggers and messages may evolve
// with time.  Event consumers should not rely on the timing of an event
// with a given Reason reflecting a consistent underlying trigger, or the
// continued existence of events with that Reason.  Events should be
// treated as informative, best-effort, supplemental data.
message Event {
  // Standard object's metadata.

import java.util.Collections;
import java.util.List;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Tests may use this to intercept messages that are logged by the code under test. Example:
 *
 * <pre>
 *   TestLogHandler handler;
 *
 *   protected void setUp() throws Exception {
 *     super.setUp();
 *     handler = new TestLogHandler();

 *
 * Despite its name, [java.net.URL.getProtocol] returns the [scheme][java.net.URI.getScheme] (http,
 * https, etc.) of the URL, not the protocol (http/1.1, spdy/3.1, etc.). OkHttp uses the word
 * *protocol* to identify how HTTP messages are framed.
 *
 * [ietf_alpn]: http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg
 */
enum class Protocol(private val protocol: String) {
  /**

            if (queryCommand != null) {
                return queryCommand.execute(context, query, boost);
            }
            throw new InvalidQueryException(messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY),
                    "Unknown q: " + query.getClass() + " => " + query);
        };
    }

    public interface Filter {

    @Execute
    public JsonResponse<ApiResult> put$index(final InstallBody body) {
        validateApi(body, messages -> {});
        final Artifact artifact = ComponentUtil.getPluginHelper().getArtifact(body.name, body.version);
        if (artifact == null) {
            return asJson(
                    new ApiResult.ApiErrorResponse().message("invalid name or version").status(ApiResult.Status.BAD_REQUEST).result());
        }

				VersionID: req.VersionID,
				Objects:   objects,
			},
		},
	}

	if trace != nil {
		entry.Trace = &log.Trace{
			Message:   message,
			Source:    trace,
			Variables: tags,
		}
	} else {
		entry.Message = message
	}

	if anonFlag {
		entry.API.Args.Bucket = HashString(entry.API.Args.Bucket)
		entry.API.Args.Object = HashString(entry.API.Args.Object)