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## org.springframework.web.servlet.mvc
Interface LastModified

All Known Implementing Classes:
  MultiActionController

    public interface LastModified

Supports last-modified HTTP requests to facilitate content caching. Same contract as for the Servlet API's `getLastModified` method.

Delegated to by a `HandlerAdapter.getLastModified(javax.servlet.http.HttpServletRequest, java.lang.Object)` implementation. By default, any Controller or HttpRequestHandler within Spring's default framework can implement this interface to enable last-modified checking.

Note: Alternative handler implementation approaches have different last-modified handling styles. For example, Spring 2.5's annotated controller approach (using `@RequestMapping`) provides last-modified support through the `WebRequest.checkNotModified(long)` method, allowing for last-modified checking within the main handler method.

Author:
  Rod Johnson, Juergen Hoeller
See Also:
  `HttpServlet.getLastModified(javax.servlet.http.HttpServletRequest)`, `Controller`, `SimpleControllerHandlerAdapter`, `HttpRequestHandler`, `HttpRequestHandlerAdapter`

Method Summary
`long` | `getLastModified(HttpServletRequest request)` Same contract as for HttpServlet's `getLastModified` method.

Method Detail

### getLastModified

    long getLastModified(HttpServletRequest request)

  Same contract as for HttpServlet's `getLastModified` method. Invoked before request processing.

  The return value will be sent to the HTTP client as Last-Modified header, and compared with If-Modified-Since headers that the client sends back. The content will only get regenerated if there has been a modification.

  Parameters:
    `request` - current HTTP request
  Returns:
    the time the underlying resource was last modified, or -1 meaning that the content must always be regenerated
  See Also:
    `HandlerAdapter.getLastModified(javax.servlet.http.HttpServletRequest, java.lang.Object)`, `HttpServlet.getLastModified(javax.servlet.http.HttpServletRequest)`

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