Re: sessions and redirecting in opera


"Jerry Stuckle" <jstucklex@xxxxxxxxxxxxx> schreef in bericht
news:xqKdnb9U2fBnMyLbnZ2dnUVZ_uLinZ2d@xxxxxxxxxxxxxx
amygdala wrote:
Rik wrote:
On Fri, 10 Aug 2007 20:07:03 +0200, amygdala <noreply@xxxxxxxxxxx>
wrote:
Could it be that Opera needs some kind of body content after a
redirection
header? Or could it perhaps be that Opera indeed thinks that it
should redirect back to the login page again, since it is redirected
to a page, that redirected to the login page in the first place. lol
Possiblity 1:
Opera -> Tools -> preferences -> Advanced -> Network -> Enable
Automatic Redirection.

It's enabled by default, but can be disabled for whatever purpose.
All the more reason why a header redirect should be accompanied by
some information one is redirected, and a script should die()/exit()
after that.
Possibility 2:
Opera get's the redirect, but still has the page with the same URL in
cache, so decides to use that one. Set some header and/or html
information these pages should not be cached.

Possibility 3:
The script isn't terminated after the first header-redirect,
continues to run, and effectively changes the redirect by a second
header() call. Putting an echo directly after it will force the
headers to be sent, so they cannot be replaced anymore, resulting in
the first one being the only one, and thus the one obeyed by the
browser. Another example why one should die()/exit() after a redirect.

<?php
//this will offcourse end in /second.html
header('Location: /first.html');
header('Location: /second.html');
<?php
//this will end in /first.html
header('Location: /first.html');
flush();
header('Location: /second.html');

This thing still has me puzzled. What I did is the following:

My SessionHandler class has the following method:

public function redirect( $url )
{
session_write_close();
header( 'Expires: Mon, 26 Jul 1997 05:00:00 GMT' );
header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
header( 'Cache-Control: no-store, no-cache, must-revalidate' );
header( 'Cache-Control: post-check=0, pre-check=0', false );
header( 'Pragma: no-cache' );
header( 'HTTP/1.0 302 Moved Temporarily' );
header( 'Location: ' . $url );
// this part between the comments is important
echo 'You\'re being redirected to ' . $url . ' .
Click <a href="' . $url. '">here</a> if it doesn\'t work';
// end important part
exit(); // exit doesn't really make a difference for Opera
}

Since I have now included the exit() statement I am sure that this is the
last thing done by the application when redirecting. Also, I have added
cache control headers and the likes. But still in Opera the problem
persists if I leave out the echo part you see above between the comments.

So, from my experience it seems as if Opera wants some body content for
the redirect to work and revalidate the url I landed on before I had to
log in.

Does anyone have any other clue as to what might be going on here?

Thanks.

Why are you sending a message they will never see, anyway? Normally a
redirect header has NO text associated with it.

If you have your header set up appropriately, they will be redirected. All
the message might do is screw things up for the browser.


PS.: Correct me if I'm wrong, but are my headers not set up properly?


.

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