+ if ($len == -1) {
+ $s .= "Cache-Control: no-cache, must-revalidate\r\n";
+ $s .= "Expires: Mon, 26 Jul 1997 05:00:00 GMT\r\n";
+ $s .= "Content-Encoding: chunked\r\n";
+ $s .= "Transfer-Encoding: chunked\r\n";
+ }
+ else if ($len > 0) {
+ $s .= sprintf("Content-Length: %d\r\n", $len);
+ }