Java Code Examples for org.springframework.http.server.ServerHttpResponse#flush()

@Override
protected void writeFrameInternal(SockJsFrame frame) throws IOException {
	if (isActive()) {
		SockJsFrameFormat frameFormat = this.frameFormat;
		ServerHttpResponse response = this.response;
		if (frameFormat != null && response != null) {
			String formattedFrame = frameFormat.format(frame);
			if (logger.isTraceEnabled()) {
				logger.trace("Writing to HTTP response: " + formattedFrame);
			}
			response.getBody().write(formattedFrame.getBytes(SockJsFrame.CHARSET));
			response.flush();
		}
	}
}
 

@ResponseBody
@RequestMapping(path = INSTANCE_MAPPED_PATH, method = { RequestMethod.GET, RequestMethod.HEAD, RequestMethod.POST,
		RequestMethod.PUT, RequestMethod.PATCH, RequestMethod.DELETE, RequestMethod.OPTIONS })
public Mono<Void> endpointProxy(@PathVariable("instanceId") String instanceId, HttpServletRequest servletRequest,
		HttpServletResponse servletResponse) throws IOException {
	ServerHttpRequest request = new ServletServerHttpRequest(servletRequest);
	String endpointLocalPath = this.getEndpointLocalPath(this.adminContextPath + INSTANCE_MAPPED_PATH,
			servletRequest);
	URI uri = UriComponentsBuilder.fromPath(endpointLocalPath).query(request.getURI().getRawQuery()).build(true)
			.toUri();

	// We need to explicitly block until the headers are recieved and write them
	// before the async dispatch.
	// otherwise the FrameworkServlet will add wrong Allow header for OPTIONS request
	Flux<DataBuffer> requestBody = DataBufferUtils.readInputStream(request::getBody, this.bufferFactory, 4096);
	ClientResponse clientResponse = this.instanceWebProxy
			.forward(this.registry.getInstance(InstanceId.of(instanceId)), uri, request.getMethod(),
					this.httpHeadersFilter.filterHeaders(request.getHeaders()),
					BodyInserters.fromDataBuffers(requestBody))
			.block();

	ServerHttpResponse response = new ServletServerHttpResponse(servletResponse);
	response.setStatusCode(clientResponse.statusCode());
	response.getHeaders().addAll(this.httpHeadersFilter.filterHeaders(clientResponse.headers().asHttpHeaders()));
	OutputStream responseBody = response.getBody();
	response.flush();

	return clientResponse.body(BodyExtractors.toDataBuffers()).window(1)
			.concatMap((body) -> writeAndFlush(body, responseBody)).then();
}
 

@Override
protected void handleRequestInternal(ServerHttpRequest request, ServerHttpResponse response,
		boolean initialRequest) throws IOException {

	byte[] prelude = getPrelude(request);
	Assert.notNull(prelude);
	response.getBody().write(prelude);
	response.flush();

	if (initialRequest) {
		writeFrame(SockJsFrame.openFrame());
	}
	flushCache();
}
 

@Override
public void handleReturnValue(Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (returnValue instanceof ResponseEntity) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		response.setStatus(responseEntity.getStatusCodeValue());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			outputMessage.flush();
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	ShallowEtagHeaderFilter.disableContentCaching(request);

	Assert.isInstanceOf(StreamingResponseBody.class, returnValue, "StreamingResponseBody expected");
	StreamingResponseBody streamingBody = (StreamingResponseBody) returnValue;

	Callable<Void> callable = new StreamingResponseBodyTask(outputMessage.getBody(), streamingBody);
	WebAsyncUtils.getAsyncManager(webRequest).startCallableProcessing(callable, mavContainer);
}
 

@Override
protected void handleRequestInternal(ServerHttpRequest request, ServerHttpResponse response,
		boolean initialRequest) throws IOException {

	byte[] prelude = getPrelude(request);
	response.getBody().write(prelude);
	response.flush();

	if (initialRequest) {
		writeFrame(SockJsFrame.openFrame());
	}
	flushCache();
}
 

@Override
@SuppressWarnings("resource")
public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	Assert.state(response != null, "No HttpServletResponse");
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (returnValue instanceof ResponseEntity) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		response.setStatus(responseEntity.getStatusCodeValue());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			outputMessage.flush();
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	Assert.state(request != null, "No ServletRequest");
	ShallowEtagHeaderFilter.disableContentCaching(request);

	Assert.isInstanceOf(StreamingResponseBody.class, returnValue, "StreamingResponseBody expected");
	StreamingResponseBody streamingBody = (StreamingResponseBody) returnValue;

	Callable<Void> callable = new StreamingResponseBodyTask(outputMessage.getBody(), streamingBody);
	WebAsyncUtils.getAsyncManager(webRequest).startCallableProcessing(callable, mavContainer);
}
 

@Override
@SuppressWarnings("resource")
public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	Assert.state(response != null, "No HttpServletResponse");
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (returnValue instanceof ResponseEntity) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		response.setStatus(responseEntity.getStatusCodeValue());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			outputMessage.flush();
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	Assert.state(request != null, "No ServletRequest");
	ShallowEtagHeaderFilter.disableContentCaching(request);

	Assert.isInstanceOf(StreamingResponseBody.class, returnValue, "StreamingResponseBody expected");
	StreamingResponseBody streamingBody = (StreamingResponseBody) returnValue;

	Callable<Void> callable = new StreamingResponseBodyTask(outputMessage.getBody(), streamingBody);
	WebAsyncUtils.getAsyncManager(webRequest).startCallableProcessing(callable, mavContainer);
}
 

/**
 * 所以端点的请求代理入口:/instances/{instanceId}/actuator/**
 * @author xujin
 * @param instanceId
 * @param servletRequest
 * @param servletResponse
 * @return
 * @throws IOException
 */
@ResponseBody
@RequestMapping(path = REQUEST_MAPPING_PATH, method = {RequestMethod.GET, RequestMethod.HEAD, RequestMethod.POST, RequestMethod.PUT, RequestMethod.PATCH, RequestMethod.DELETE, RequestMethod.OPTIONS})
public Mono<Void> endpointProxy(@PathVariable("instanceId") String instanceId,
                                HttpServletRequest servletRequest,
                                HttpServletResponse servletResponse) throws IOException {
    ServerHttpRequest request = new ServletServerHttpRequest(servletRequest);

    String pathWithinApplication = UriComponentsBuilder.fromPath(servletRequest.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE)
                                                                               .toString()).toUriString();
    String endpointLocalPath = getEndpointLocalPath(pathWithinApplication);

    URI uri = UriComponentsBuilder.fromPath(endpointLocalPath)
                                  .query(request.getURI().getRawQuery())
                                  .build(true)
                                  .toUri();

    //We need to explicitly block until the headers are recieved and write them before the async dispatch.
    //otherwise the FrameworkServlet will add wrong Allow header for OPTIONS request
    ClientResponse clientResponse = super.forward(instanceId,
        uri,
        request.getMethod(),
        request.getHeaders(),
        () -> BodyInserters.fromDataBuffers(DataBufferUtils.readInputStream(request::getBody,
            this.bufferFactory,
            4096
        ))
    ).block();

    ServerHttpResponse response = new ServletServerHttpResponse(servletResponse);
    response.setStatusCode(clientResponse.statusCode());
    response.getHeaders().addAll(filterHeaders(clientResponse.headers().asHttpHeaders()));
    OutputStream responseBody = response.getBody();
    response.flush();

    return clientResponse.body(BodyExtractors.toDataBuffers())
                         .window(1)
                         .concatMap(body -> writeAndFlush(body, responseBody))
                         .then();
}
 

@Override
protected void handleRequestInternal(ServerHttpRequest request, ServerHttpResponse response,
		boolean initialRequest) throws IOException {

	byte[] prelude = getPrelude(request);
	response.getBody().write(prelude);
	response.flush();

	if (initialRequest) {
		writeFrame(SockJsFrame.openFrame());
	}
	flushCache();
}
 

@Override
protected void writeFrameInternal(SockJsFrame frame) throws IOException {
	if (isActive()) {
		SockJsFrameFormat frameFormat = this.frameFormat;
		ServerHttpResponse response = this.response;
		if (frameFormat != null && response != null) {
			String formattedFrame = frameFormat.format(frame);
			if (logger.isTraceEnabled()) {
				logger.trace("Writing to HTTP response: " + formattedFrame);
			}
			response.getBody().write(formattedFrame.getBytes(SockJsFrame.CHARSET));
			response.flush();
		}
	}
}
 

@Override
@SuppressWarnings("resource")
public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	Assert.state(response != null, "No HttpServletResponse");
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (returnValue instanceof ResponseEntity) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		response.setStatus(responseEntity.getStatusCodeValue());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		returnType = returnType.nested();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			outputMessage.flush();
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	Assert.state(request != null, "No ServletRequest");

	ResponseBodyEmitter emitter;
	if (returnValue instanceof ResponseBodyEmitter) {
		emitter = (ResponseBodyEmitter) returnValue;
	}
	else {
		emitter = this.reactiveHandler.handleValue(returnValue, returnType, mavContainer, webRequest);
		if (emitter == null) {
			// Not streaming: write headers without committing response..
			outputMessage.getHeaders().forEach((headerName, headerValues) -> {
				for (String headerValue : headerValues) {
					response.addHeader(headerName, headerValue);
				}
			});
			return;
		}
	}
	emitter.extendResponse(outputMessage);

	// At this point we know we're streaming..
	ShallowEtagHeaderFilter.disableContentCaching(request);

	// Commit the response and wrap to ignore further header changes
	outputMessage.getBody();
	outputMessage.flush();
	outputMessage = new StreamingServletServerHttpResponse(outputMessage);

	DeferredResult<?> deferredResult = new DeferredResult<>(emitter.getTimeout());
	WebAsyncUtils.getAsyncManager(webRequest).startDeferredResultProcessing(deferredResult, mavContainer);

	HttpMessageConvertingHandler handler = new HttpMessageConvertingHandler(outputMessage, deferredResult);
	emitter.initialize(handler);
}
 

/**
 * Handle the given request.
 */
protected boolean handleInternal(ServerHttpRequest request, ServerHttpResponse response,
		CorsConfiguration config, boolean preFlightRequest) throws IOException {

	String requestOrigin = request.getHeaders().getOrigin();
	String allowOrigin = checkOrigin(config, requestOrigin);
	HttpHeaders responseHeaders = response.getHeaders();

	if (allowOrigin == null) {
		logger.debug("Reject: '" + requestOrigin + "' origin is not allowed");
		rejectRequest(response);
		return false;
	}

	HttpMethod requestMethod = getMethodToUse(request, preFlightRequest);
	List<HttpMethod> allowMethods = checkMethods(config, requestMethod);
	if (allowMethods == null) {
		logger.debug("Reject: HTTP '" + requestMethod + "' is not allowed");
		rejectRequest(response);
		return false;
	}

	List<String> requestHeaders = getHeadersToUse(request, preFlightRequest);
	List<String> allowHeaders = checkHeaders(config, requestHeaders);
	if (preFlightRequest && allowHeaders == null) {
		logger.debug("Reject: headers '" + requestHeaders + "' are not allowed");
		rejectRequest(response);
		return false;
	}

	responseHeaders.setAccessControlAllowOrigin(allowOrigin);

	if (preFlightRequest) {
		responseHeaders.setAccessControlAllowMethods(allowMethods);
	}

	if (preFlightRequest && !allowHeaders.isEmpty()) {
		responseHeaders.setAccessControlAllowHeaders(allowHeaders);
	}

	if (!CollectionUtils.isEmpty(config.getExposedHeaders())) {
		responseHeaders.setAccessControlExposeHeaders(config.getExposedHeaders());
	}

	if (Boolean.TRUE.equals(config.getAllowCredentials())) {
		responseHeaders.setAccessControlAllowCredentials(true);
	}

	if (preFlightRequest && config.getMaxAge() != null) {
		responseHeaders.setAccessControlMaxAge(config.getMaxAge());
	}

	response.flush();
	return true;
}
 

/**
 * Invoked when one of the CORS checks failed.
 * The default implementation sets the response status to 403 and writes
 * "Invalid CORS request" to the response.
 */
protected void rejectRequest(ServerHttpResponse response) throws IOException {
	response.setStatusCode(HttpStatus.FORBIDDEN);
	response.getBody().write("Invalid CORS request".getBytes(StandardCharsets.UTF_8));
	response.flush();
}
 

/**
 * Handle the given request.
 */
protected boolean handleInternal(ServerHttpRequest request, ServerHttpResponse response,
		CorsConfiguration config, boolean preFlightRequest) throws IOException {

	String requestOrigin = request.getHeaders().getOrigin();
	String allowOrigin = checkOrigin(config, requestOrigin);
	HttpHeaders responseHeaders = response.getHeaders();

	responseHeaders.addAll(HttpHeaders.VARY, Arrays.asList(HttpHeaders.ORIGIN,
			HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD, HttpHeaders.ACCESS_CONTROL_REQUEST_HEADERS));

	if (allowOrigin == null) {
		logger.debug("Reject: '" + requestOrigin + "' origin is not allowed");
		rejectRequest(response);
		return false;
	}

	HttpMethod requestMethod = getMethodToUse(request, preFlightRequest);
	List<HttpMethod> allowMethods = checkMethods(config, requestMethod);
	if (allowMethods == null) {
		logger.debug("Reject: HTTP '" + requestMethod + "' is not allowed");
		rejectRequest(response);
		return false;
	}

	List<String> requestHeaders = getHeadersToUse(request, preFlightRequest);
	List<String> allowHeaders = checkHeaders(config, requestHeaders);
	if (preFlightRequest && allowHeaders == null) {
		logger.debug("Reject: headers '" + requestHeaders + "' are not allowed");
		rejectRequest(response);
		return false;
	}

	responseHeaders.setAccessControlAllowOrigin(allowOrigin);

	if (preFlightRequest) {
		responseHeaders.setAccessControlAllowMethods(allowMethods);
	}

	if (preFlightRequest && !allowHeaders.isEmpty()) {
		responseHeaders.setAccessControlAllowHeaders(allowHeaders);
	}

	if (!CollectionUtils.isEmpty(config.getExposedHeaders())) {
		responseHeaders.setAccessControlExposeHeaders(config.getExposedHeaders());
	}

	if (Boolean.TRUE.equals(config.getAllowCredentials())) {
		responseHeaders.setAccessControlAllowCredentials(true);
	}

	if (preFlightRequest && config.getMaxAge() != null) {
		responseHeaders.setAccessControlMaxAge(config.getMaxAge());
	}

	response.flush();
	return true;
}
 

@Override
public void handleReturnValue(Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (returnValue instanceof ResponseEntity) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		response.setStatus(responseEntity.getStatusCodeValue());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			outputMessage.flush();
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	ShallowEtagHeaderFilter.disableContentCaching(request);

	ResponseBodyEmitterAdapter adapter = getAdapterFor(returnValue.getClass());
	if (adapter == null) {
		throw new IllegalStateException(
				"Could not find ResponseBodyEmitterAdapter for return value type: " + returnValue.getClass());
	}
	ResponseBodyEmitter emitter = adapter.adaptToEmitter(returnValue, outputMessage);
	emitter.extendResponse(outputMessage);

	// Commit the response and wrap to ignore further header changes
	outputMessage.getBody();
	outputMessage.flush();
	outputMessage = new StreamingServletServerHttpResponse(outputMessage);

	DeferredResult<?> deferredResult = new DeferredResult<Object>(emitter.getTimeout());
	WebAsyncUtils.getAsyncManager(webRequest).startDeferredResultProcessing(deferredResult, mavContainer);

	HttpMessageConvertingHandler handler = new HttpMessageConvertingHandler(outputMessage, deferredResult);
	emitter.initialize(handler);
}
 

/**
 * Handle the given request.
 */
protected boolean handleInternal(ServerHttpRequest request, ServerHttpResponse response,
		CorsConfiguration config, boolean preFlightRequest) throws IOException {

	String requestOrigin = request.getHeaders().getOrigin();
	String allowOrigin = checkOrigin(config, requestOrigin);

	HttpMethod requestMethod = getMethodToUse(request, preFlightRequest);
	List<HttpMethod> allowMethods = checkMethods(config, requestMethod);

	List<String> requestHeaders = getHeadersToUse(request, preFlightRequest);
	List<String> allowHeaders = checkHeaders(config, requestHeaders);

	if (allowOrigin == null || allowMethods == null || (preFlightRequest && allowHeaders == null)) {
		rejectRequest(response);
		return false;
	}

	HttpHeaders responseHeaders = response.getHeaders();
	responseHeaders.setAccessControlAllowOrigin(allowOrigin);
	responseHeaders.add(HttpHeaders.VARY, HttpHeaders.ORIGIN);

	if (preFlightRequest) {
		responseHeaders.setAccessControlAllowMethods(allowMethods);
	}

	if (preFlightRequest && !allowHeaders.isEmpty()) {
		responseHeaders.setAccessControlAllowHeaders(allowHeaders);
	}

	if (!CollectionUtils.isEmpty(config.getExposedHeaders())) {
		responseHeaders.setAccessControlExposeHeaders(config.getExposedHeaders());
	}

	if (Boolean.TRUE.equals(config.getAllowCredentials())) {
		responseHeaders.setAccessControlAllowCredentials(true);
	}

	if (preFlightRequest && config.getMaxAge() != null) {
		responseHeaders.setAccessControlMaxAge(config.getMaxAge());
	}

	response.flush();
	return true;
}
 

@Override
public void handleReturnValue(Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (ResponseEntity.class.isAssignableFrom(returnValue.getClass())) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		outputMessage.setStatusCode(responseEntity.getStatusCode());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	ShallowEtagHeaderFilter.disableContentCaching(request);

	Assert.isInstanceOf(ResponseBodyEmitter.class, returnValue);
	ResponseBodyEmitter emitter = (ResponseBodyEmitter) returnValue;
	emitter.extendResponse(outputMessage);

	// Commit the response and wrap to ignore further header changes
	outputMessage.getBody();
	outputMessage.flush();
	outputMessage = new StreamingServletServerHttpResponse(outputMessage);

	DeferredResult<?> deferredResult = new DeferredResult<Object>(emitter.getTimeout());
	WebAsyncUtils.getAsyncManager(webRequest).startDeferredResultProcessing(deferredResult, mavContainer);

	HttpMessageConvertingHandler handler = new HttpMessageConvertingHandler(outputMessage, deferredResult);
	emitter.initialize(handler);
}
 

/**
 * Handle the given request.
 */
protected boolean handleInternal(ServerHttpRequest request, ServerHttpResponse response,
		CorsConfiguration config, boolean preFlightRequest) throws IOException {

	String requestOrigin = request.getHeaders().getOrigin();
	String allowOrigin = checkOrigin(config, requestOrigin);

	HttpMethod requestMethod = getMethodToUse(request, preFlightRequest);
	List<HttpMethod> allowMethods = checkMethods(config, requestMethod);

	List<String> requestHeaders = getHeadersToUse(request, preFlightRequest);
	List<String> allowHeaders = checkHeaders(config, requestHeaders);

	if (allowOrigin == null || allowMethods == null || (preFlightRequest && allowHeaders == null)) {
		rejectRequest(response);
		return false;
	}

	HttpHeaders responseHeaders = response.getHeaders();
	responseHeaders.setAccessControlAllowOrigin(allowOrigin);
	responseHeaders.add(HttpHeaders.VARY, HttpHeaders.ORIGIN);

	if (preFlightRequest) {
		responseHeaders.setAccessControlAllowMethods(allowMethods);
	}

	if (preFlightRequest && !allowHeaders.isEmpty()) {
		responseHeaders.setAccessControlAllowHeaders(allowHeaders);
	}

	if (!CollectionUtils.isEmpty(config.getExposedHeaders())) {
		responseHeaders.setAccessControlExposeHeaders(config.getExposedHeaders());
	}

	if (Boolean.TRUE.equals(config.getAllowCredentials())) {
		responseHeaders.setAccessControlAllowCredentials(true);
	}

	if (preFlightRequest && config.getMaxAge() != null) {
		responseHeaders.setAccessControlMaxAge(config.getMaxAge());
	}

	response.flush();
	return true;
}
 

@Override
@SuppressWarnings("resource")
public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType,
		ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {

	if (returnValue == null) {
		mavContainer.setRequestHandled(true);
		return;
	}

	HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
	Assert.state(response != null, "No HttpServletResponse");
	ServerHttpResponse outputMessage = new ServletServerHttpResponse(response);

	if (returnValue instanceof ResponseEntity) {
		ResponseEntity<?> responseEntity = (ResponseEntity<?>) returnValue;
		response.setStatus(responseEntity.getStatusCodeValue());
		outputMessage.getHeaders().putAll(responseEntity.getHeaders());
		returnValue = responseEntity.getBody();
		returnType = returnType.nested();
		if (returnValue == null) {
			mavContainer.setRequestHandled(true);
			outputMessage.flush();
			return;
		}
	}

	ServletRequest request = webRequest.getNativeRequest(ServletRequest.class);
	Assert.state(request != null, "No ServletRequest");

	ResponseBodyEmitter emitter;
	if (returnValue instanceof ResponseBodyEmitter) {
		emitter = (ResponseBodyEmitter) returnValue;
	}
	else {
		emitter = this.reactiveHandler.handleValue(returnValue, returnType, mavContainer, webRequest);
		if (emitter == null) {
			// Not streaming: write headers without committing response..
			outputMessage.getHeaders().forEach((headerName, headerValues) -> {
				for (String headerValue : headerValues) {
					response.addHeader(headerName, headerValue);
				}
			});
			return;
		}
	}
	emitter.extendResponse(outputMessage);

	// At this point we know we're streaming..
	ShallowEtagHeaderFilter.disableContentCaching(request);

	// Wrap the response to ignore further header changes
	// Headers will be flushed at the first write
	outputMessage = new StreamingServletServerHttpResponse(outputMessage);

	DeferredResult<?> deferredResult = new DeferredResult<>(emitter.getTimeout());
	WebAsyncUtils.getAsyncManager(webRequest).startDeferredResultProcessing(deferredResult, mavContainer);

	HttpMessageConvertingHandler handler = new HttpMessageConvertingHandler(outputMessage, deferredResult);
	emitter.initialize(handler);
}