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doFilter() method clarrification please

 
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Hi All,

I found a statement in Head First

A filter's doFilter() may block further request processing


what does it mean ? how doFilter() can block further request, it has to keep on moving right ?
 
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It can bkz this method can throw any exception and stop further processing.
 
Greenhorn
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Anytime while processing the request, if the filter grades that the request should be dropped, the filter will not call chain.doFilter(request,response).

Thus the request is said to be dropped. The doFilter method of Filter interface returns normally as if nothing happened.
 
Garlapati Ravi
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got the point, thanks for your comments.
 
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