Module com.aoapps.servlet.lastmodified

Package com.aoapps.servlet.lastmodified

Class LastModifiedHeaderFilter

java.lang.Object

com.aoapps.servlet.lastmodified.LastModifiedHeaderFilter

All Implemented Interfaces:

Filter

public class LastModifiedHeaderFilter
extends Object
implements Filter

Adds cache-control and Link: <…>; rel="canonical" headers to any request with a LastModifiedServlet.LAST_MODIFIED_PARAMETER_NAME parameter. The headers are added before the filter chain is called.

This should be used for the DispatcherType.REQUEST dispatcher only.

Init Parameters:
    cache-control: The content of the cache-control header,
                   defaults to "public,max-age=31557600,max-stale=31557600,stale-while-revalidate=31557600,stale-if-error=31557600,immutable"

See also:

1. Cache-Control - HTTP | MDN
2. Keeping things fresh with stale-while-revalidate
3. Why we set a `Cache-Control: Max-Age` of 1 year
4. Uses inefficient cache policy on static assets
5. How to Specify a Canonical with rel="canonical" and Other Methods

See Also:

• for supported patterns

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_CACHE_CONTROL	The default, very aggressive, cache-control header value.

Constructor Summary

Constructors

Constructor	Description
LastModifiedHeaderFilter()

Method Summary

Modifier and Type	Method	Description
void	destroy()
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
void	init(FilterConfig config)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_CACHE_CONTROL

public static final String DEFAULT_CACHE_CONTROL

The default, very aggressive, cache-control header value.

See Also:

• Constant Field Values

Constructor Details

LastModifiedHeaderFilter

public LastModifiedHeaderFilter()

Method Details

init

public void init(FilterConfig config)

Specified by:

init in interface Filter

doFilter

public void doFilter(ServletRequest request,
 ServletResponse response,
 FilterChain chain)
              throws IOException,
ServletException

Specified by:

doFilter in interface Filter

Throws:

IOException

ServletException

destroy

public void destroy()

Specified by:

destroy in interface Filter