Greetings.

If I am sending from my php script
Header('Last-Modified: '.gmdate("D, d M Y H:i:s",$last_modified).' GMT ');

In The next request to the same page the browser will send me a If-Modified-Since
header. This works fine, Until I add anywhere in the page session_start (before or after the headers).

Have anyone any idea how to solve this?

Thanks
IM

    Well, it seesm session_start do some noty things like throwing some headers, If I erase them, it is OK:
    header('Cache-Control: ',true);
    header("Pragma: ", true);
    header("Expires: ", true);

      header('Cache-Control: ',true);
header("Pragma: ", true);
header("Expires: ", true);

      What values are these headers supposed to have?

        header('Cache-Control: ',true);
header("Pragma: ", true);
header("Expires: ", true);

        What values are these headers supposed to have?

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