End the current request. It is acceptable to write extra bytes using
buffer.doWrite during the execution of this method.
Should return 0 unless the filter does some content length delimitation, in which case the number is the amount of extra bytes ormissing bytes, which would indicate an error. Note: It is recommended that extra bytes be swallowed by the filter.
Some filters need additional parameters from the response. All the
necessary reading can occur in that method, as this method is called
after the response header processing is complete.