unshift_write(type => @args) =head2 unshift_write($cb->($handle)) Analogically to "unshift_read", it unshift write data at the beginngin of queue. The only recommended usage is from write callback

     $handle->push_write("1")
     $handle->push_write(sub {
        my $h = shift;
        $h->unshift_write("2");
        return 1;
     });
     $handle->push_write("3");
     
 # The output will be "123"

push_sendfile($filename, [$size, [$offset]]);
  Push sendfile operation into write queue. If sendfile cannot be found
  (Sys::Sendfile) or if it fails with one of ENOSYS, ENOTSUP, EOPNOTSUPP,
  EAFNOSUPPORT, EPROTOTYPE or ENOTSOCK, it will be emulated with chunked
  read/write

     $handle->push_write("HTTP/1.0 200 OK\nContent-length: $size\n...\n\n");
     $handle->push_sendfile($file, $size, $offset);

ACKNOWLEDGEMENTS AUTHOR Mons Anderson, "<mons at cpan.org>"

LICENSE This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.