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function filter_content_match_protocols( $content ) {
	$search = $replace = get_bloginfo( 'home' );
	
	if ( ! preg_match( '|/$|', $search ) )
		$search = $replace = "$search/";
	
	if ( is_ssl() ) {
		$search = str_replace( 'https://', 'http://', $search );
		$replace = str_replace( 'http://', 'https://', $replace );
	}
	else {
		$search = str_replace( 'http://', 'https://', $search );
		$replace = str_replace( 'https://', 'http://', $replace );
	}
	
	$content = str_replace( $search, $replace, $content );
	
	return $content;
}
ob_start( 'filter_content_match_protocols' );

function filter_content_match_protocols_end() {
	ob_end_flush();
}
add_action( 'shutdown', 'filter_content_match_protocols_end', -10 );