David -
Tomcat uses cookies to establish a session with the browser. If it
can't use cookies, it uses URL rewriting. So whenever someone uses my app,
Tomcat tries to set a cookie.
If it was the case that Tomcat didn't know whether the browser
accepted cookies until after it tried to set one at the first access,
users of browsers that did not accept cookies would not have a session
that recorded their first access. I don't think that would be considered
acceptable, so I assume that Tomcat knows, before my app is reached,
whether the browser accepts cookies. But is my assumption correct, I don't
know. That is what I am asking.
Garey Mills
Library Systems Office
UC Berkeley
The brain is not where you think
On Wed, 21 Jun 2006, David Kerber wrote:
> Why would it try until your app tells it to? AFAIK (admittedly, not
> very far; I don't use cookies) think it needs to be handled by your app.
>
>
> Garey Mills wrote:
>
> >David -
> >
> > Well, okay then, but how can my app find out what Tomcat knows
> >about whether the browser accepts cookies or not? And when does Tomcat
> >try? Before control is passed to my app?
> >
> >Garey Mills
> >Library Systems Office
> >UC Berkeley
> >
> >The brain is not where you think
> >
> >On Wed, 21 Jun 2006, David Kerber wrote:
> >
> >
> >
> >>I think what he's getting at is that Tomcat (or any other web server)
> >>cannot tell how a browser is set wrt cookies without trying to set one
> >>and then seeing if it's there.
> >>
> >>Garey Mills wrote:
> >>
> >>
> >>
> >>>Martin -
> >>>
> >>> I guess I'm being obtuse, but WHAT won't work? What I want to know
> >>>is how Tomcat detects whether the browser accepts cookies, that is,
> >>>whether it is set to accept cookies or not?
> >>>
> >>>Garey Mills
> >>>Library Systems Office
> >>>UC Berkeley
> >>>
> >>>The brain is not where you think
> >>>
> >>>On Wed, 21 Jun 2006, Martin Gainty wrote:
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>Garey-
> >>>>
> >>>>Unfortunately that wont work if your Browser disallows cookies
> >>>>If its IE
> >>>>Check out the IE options-
> >>>>
> >>>>Tools
> >>>>Internet Options
> >>>>Privacy
> >>>>Advanced
> >>>>look at "switched on Always allow Session Cookies"
> >>>>
> >>>>HTH,
> >>>>
> >>>>Martin --
> >>>>*********************************************************************
> >>>>This email message and any files transmitted with it contain confidential
> >>>>information intended only for the person(s) to whom this email message is
> >>>>addressed. If you have received this email message in error, please
> >>>>notify
> >>>>the sender immediately by telephone or email and destroy the original
> >>>>message without making a copy. Thank you.
> >>>>
> >>>>
> >>>>
> >>>>----- Original Message -----
> >>>>From: "Garey Mills" <[EMAIL PROTECTED]>
> >>>>To: "Tomcat Users List" <users@tomcat.apache.org>
> >>>>Sent: Wednesday, June 21, 2006 12:50 PM
> >>>>Subject: Re: How does Tomcat detect whether a browser accepts cookies
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Leon -
> >>>>>
> >>>>>Thank you for your response, but I don't understand it. I have a
> >>>>>key question:
> >>>>>
> >>>>>how does Tomcat detect that a browser does not accept cookies?
> >>>>>
> >>>>>
> >>>>>There are a number of different ways to detect it inside my
> >>>>>application, but all of them seem to need a roundtrip to the browser. If,
> >>>>>as I suspect, Tomcat can tell without the redirect, I would like to use
> >>>>>Tomcat's knowledge. If Tomcat uses a roundtrip, I would still like to use
> >>>>>Tomcat's knowledge, so that I don't have to duplicate the work inside my
> >>>>>app.
> >>>>>
> >>>>>Garey Mills
> >>>>>Library Systems Office
> >>>>>UC Berkeley
> >>>>>
> >>>>>The brain is not where you think
> >>>>>
> >>>>>On Wed, 21 Jun 2006, Leon Rosenberg wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>You could check for your cookie in first request and if not present
> >>>>>>just set the cookie in the request and redirect to another page which
> >>>>>>reads the cookie (btw, it can also be done with javascript without
> >>>>>>user-visible-reload). The difference to your approach that each user
> >>>>>>will be redirected exactly once, since you are checking for your
> >>>>>>cookie in first request and it should remain persistent for next
> >>>>>>visits.
> >>>>>>
> >>>>>>regards
> >>>>>>Leon
> >>>>>>
> >>>>>>On 6/21/06, Garey Mills <[EMAIL PROTECTED]> wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>Hi -
> >>>>>>>
> >>>>>>> I have an application that does not work correctly when the
> >>>>>>>browser does not accept cookies. I added some code that rewrites the
> >>>>>>>query
> >>>>>>>string the first time the app is entered to include a new parameter and
> >>>>>>>then redirects to the app. I watch for that parameter and if I find it
> >>>>>>>I
> >>>>>>>check whether the session id is from a cookie. If it isn't I put up a
> >>>>>>>"Sorry, you need cookies message" and exit.
> >>>>>>>
> >>>>>>> This solution is not optimal, since I am seeing a blank page the
> >>>>>>>first time I try to get into the application.
> >>>>>>>
> >>>>>>> So my question is: Tomcat must ascertain whether the browser
> >>>>>>>accepts cookies in order to decide whether to use cookies or URL
> >>>>>>>rewriting. How does it do it? and can I check Tomcat to find out, too?
> >>>>>>>
> >>>>>>>Garey Mills
> >>>>>>>Library Systems Office
> >>>>>>>UC Berkeley
> >>>>>>>
> >>>>>>>The brain is not where you think
> >>>>>>>
> >>>>>>>
>
>
>
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