Example usage for org.springframework.web.filter ShallowEtagHeaderFilter disableContentCaching

Introduction

In this page you can find the example usage for org.springframework.web.filter ShallowEtagHeaderFilter disableContentCaching.

Prototype

public static void disableContentCaching(ServletRequest request) 

Source Link

Document

This method can be used to disable the content caching response wrapper of the ShallowEtagHeaderFilter.

Usage

From source file:org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitterReturnValueHandler.java

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

    if (returnValue == null) {
        mavContainer.setRequestHandled(true);
        return;/*from  w w w .  j ava2s.c  o m*/
    }

    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..
            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);
}

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