Implements a server push operation, which updates a page at specific intervals. Parameters are:
Specifies the number of seconds, n, to wait before the next call to the page-drawing subroutine.
Runs the subroutine sublast to draw the last page update of a server push operation.
-last_page routine is invoked when the
-next_page routine returns
false. A reference to a subroutine glob should be provided for this
parameter, but the name of the subroutine is also acceptable.
sub is the name of the subroutine responsible for redrawing
and counting the number of iterations (if you want repeated updating). The
do_push routine ends when sub returns false (or when the
-last_page subroutine is invoked). A reference
to a subroutine glob should be provided for this parameter, but
the name of the subroutine is also acceptable.
Specifies the content type of the pushed data. The default value