@Override
	protected void onOutboundComplete() {
		if (isWebsocket()) {
			// There is no need to proceed for 'HTTP/1.1 101 Switching Protocols',
			// a full response has been sent
			return;
		}

		final ChannelFuture f;
		if (log.isDebugEnabled()) {
			log.debug(format(channel(), "Last HTTP response frame"));
		}
		if (markSentHeaderAndBody()) {
			if (log.isDebugEnabled()) {
				log.debug(format(channel(), "Headers are not sent before onComplete()."));
			}

			f = channel().writeAndFlush(fullHttpResponse != null ? fullHttpResponse : newFullBodyMessage(EMPTY_BUFFER));
		}
		else if (markSentBody()) {
			HttpHeaders trailerHeaders = null;
			// https://datatracker.ietf.org/doc/html/rfc7230#section-4.1.2
			// A trailer allows the sender to include additional fields at the end
			// of a chunked message in order to supply metadata that might be
			// dynamically generated while the message body is sent, such as a
			// message integrity check, digital signature, or post-processing
			// status.
			if (trailerHeadersConsumer != null && isTransferEncodingChunked(nettyResponse)) {
				// https://datatracker.ietf.org/doc/html/rfc7230#section-4.4
				// When a message includes a message body encoded with the chunked
				// transfer coding and the sender desires to send metadata in the form
				// of trailer fields at the end of the message, the sender SHOULD
				// generate a Trailer header field before the message body to indicate
				// which fields will be present in the trailers.
				String declaredHeaderNames = responseHeaders.get(HttpHeaderNames.TRAILER);
				if (declaredHeaderNames != null) {
					trailerHeaders = new TrailerHeaders(declaredHeaderNames);
					try {
						trailerHeadersConsumer.accept(trailerHeaders);
					}
					catch (IllegalArgumentException e) {
						// A sender MUST NOT generate a trailer when header names are
						// HttpServerOperations.TrailerHeaders.DISALLOWED_TRAILER_HEADER_NAMES
						log.error(format(channel(), "Cannot apply trailer headers [{}]"), declaredHeaderNames, e);
					}
				}
			}

			f = channel().writeAndFlush(trailerHeaders != null && !trailerHeaders.isEmpty() ?
					new DefaultLastHttpContent(Unpooled.buffer(0), trailerHeaders) :
					EMPTY_LAST_CONTENT);
		}
		else {
			discard();
			terminate();
			return;
		}
		f.addListener(this);
	}