SpringCloud Gateway HttpWebHandlerAdapter链路调用请求流程介绍

	NettyReactiveWebServerFactory.java
	@Override
	public WebServer getWebServer(HttpHandler httpHandler) {
		HttpServer httpServer = createHttpServer();
		ReactorHttpHandlerAdapter handlerAdapter = new ReactorHttpHandlerAdapter(httpHandler);
		NettyWebServer webServer = createNettyWebServer(httpServer, handlerAdapter, this.lifecycleTimeout,
				getShutdown());
		webServer.setRouteProviders(this.routeProviders);
		return webServer;
	}

	@Override
	public Mono<Void> apply(HttpServerRequest reactorRequest, HttpServerResponse reactorResponse) {
		NettyDataBufferFactory bufferFactory = new NettyDataBufferFactory(reactorResponse.alloc());
		try {
			ReactorServerHttpRequest request = new ReactorServerHttpRequest(reactorRequest, bufferFactory);
			ServerHttpResponse response = new ReactorServerHttpResponse(reactorResponse, bufferFactory);
			if (request.getMethod() == HttpMethod.HEAD) {
				response = new HttpHeadResponseDecorator(response);
			}
             //调用handle方法
			return this.httpHandler.handle(request, response)
					.doOnError(ex -> logger.trace(request.getLogPrefix() + "Failed to complete: " + ex.getMessage()))
					.doOnSuccess(aVoid -> logger.trace(request.getLogPrefix() + "Handling completed"));
		}
		catch (URISyntaxException ex) {
			if (logger.isDebugEnabled()) {
				logger.debug("Failed to get request URI: " + ex.getMessage());
			}
			reactorResponse.status(HttpResponseStatus.BAD_REQUEST);
			return Mono.empty();
		}
	}

WebServerManager.java #WebServerManager 		
this.handler = new DelayedInitializationHttpHandler(handlerSupplier, lazyInit);
this.webServer = factory.getWebServer(this.handler);