LastModified (Spring Framework 5.2.12.RELEASE API)

```
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
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  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)