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key, otherwise the C<HTTP_X_SENDFILE_TYPE> environment variable.

See L<Plack::Middleware::XSendfile> for more information.

=item C<psgi.worker.pid>

The worker PID is added to the set.

Note that this is set after the request is processed.  This means that
while the set size can be used to indicate the number of active
workers, if the workers are busy (i.e. longer request processing
times), then this will show a lower number.

This was added in v0.3.10.

=item C<psgix.harakiri>

This counter is incremented when the harakiri flag is set.

=back