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        if ( defined $args->{content} ) {
            if (ref $args->{content} eq 'CODE') {
                $request->{headers}{'content-type'} ||= "application/octet-stream";
                $request->{headers}{'transfer-encoding'} = 'chunked'
                    unless $request->{headers}{'content-length'}
                        || $request->{headers}{'transfer-encoding'};
                $request->{cb} = $args->{content};
            }
            elsif ( length $args->{content} ) {
                my $content = $args->{content};
                if ( $] ge '5.008' ) {
                    utf8::downgrade($content, 1)
                        or die(qq/Wide character in request message body\n/);
                }
                $request->{headers}{'content-type'} ||= "application/octet-stream";
                $request->{headers}{'content-length'} = length $content
                    unless $request->{headers}{'content-length'}
                        || $request->{headers}{'transfer-encoding'};
                $request->{cb} = sub { substr $content, 0, length $content, '' };
            }
            $request->{trailer_cb} = $args->{trailer_callback}