public class OnDemandResponseBufferFilter extends HttpFilter
The response wrapper is additionally make available as a request attribute, so it's always obtainable even if a following filter
wraps the response again. By default the response wrapper is in "pass-through" mode, meaning it will do no buffering. Anywhere during the
request it can be switched to buffer by setting its
passThrough argument to false.
The next call to obtain the response's writer will then provide one that buffers. Do note that any existing writer that has been obtained
passThrough was set to false and is used afterwards, will not automatically start buffering. Only newly obtained
writers will buffer from that point on.
If at the end of the request, when this filter resumes control again, the response is still buffering (
passThrough is false)
its buffer will be automatically flushed to the underlying response. If however the buffer is not empty, but
passThrough is true,
no such flushing will be done and it's assumed the application has taken care of this.
|Constructor and Description|
|Modifier and Type||Method and Description|
Filter the HTTP request.
destroy, doFilter, getFilterConfig, getInitParameter, getServletContext, init, init
public void doFilter(HttpServletRequest request, HttpServletResponse response, HttpSession session, FilterChain chain) throws ServletException, IOException
nullif there is no session.
request- The HTTP request.
response- The HTTP response.
session- The HTTP session, if any, else
chain- The filter chain to continue.
ServletException- As wrapper exception when something fails in the request processing.
IOException- Whenever something fails at I/O level.
Filter.doFilter(ServletRequest, ServletResponse, FilterChain)
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