[Zope] Help with session data and redirects

15 Apr 2003 12:12:54 -0400

I'm afraid I can't reproduce this behavior.  Which
browser(s)/platform(s) does it occur under?

On Tue, 2003-04-15 at 12:06, Brad Powell wrote:
> Thanks, Chris, for the quick reply.  I tried both of your suggestions: the 
> random query string and the setHeader statements in the ZPT.  They both 
> improved the situation in that requests after the initial one are now 
> returned properly.  However, the very first request still returns the "Problem: no session object (redirectTest)" message.  By the way, instead of a response.redirect, if I return the page 
> template directly in the script with a statement like "return 
> container['view_session_obj.pt']()", it works perfectly.  Unfortunately, I 
> need the redirect because of the way my actual page template works.
> 
> Brad
> 
> 
> 
> 
> 
> Chris McDonough <chrism@zope.com>
> 04/15/2003 10:18 AM
> 
>         To:     Brad Powell/PPCO@Phillips
>         cc:     zope@zope.org
>         Subject:        Re: [Zope] Help with session data and redirects
> 
> 
> Under Mozilla 1.3 on Linux, when running your test (e.g. when visiting
> /createSessionAndRedirect?sessionText=456), I immediately get:
> 
> ## Page Template "view_session_obj.pt" ##
> 
> 456
> 
> Like you, I suspect this may be a browser issue. 
> 
> To verify, cause the createSessionAndRedirect to generate a "random"
> query string like this:
> 
> session = context.REQUEST.SESSION
> sessionObjName = 'redirectTest'
> session.set(sessionObjName, sessionText)
> return
> context.REQUEST.RESPONSE.redirect(context["view_session_obj.pt"].absolute_url() 
> + '?abc=%s' % context.ZopeTime().timeTime())
> 
> This should prevent browsers from returning a cached page.  A more
> permanent solution would be to set a Pragma: No-Cache or Cache-Control:
> No-Cache HTTP header within "view_session_obj.pt".
> 
> - C
> 
> 
> On Tue, 2003-04-15 at 10:58, Brad Powell wrote:
> > I have a problem where session data does not appear to be updated when 
> the 
> > setting of the session data is followed by a response.redirect in a 
> Python 
> > script.  A browser refresh is required to get the correct data 
> displayed. 
> > This happens on both Zope v2.5.1 and v2.6.1.  It also happens with IE 
> and 
> > Mozilla browsers; but, interestingly, it does not occur with the 
> Konqueror 
> > browser.  This led me to believe it was a browser issue, but no matter 
> > what options I try in IE, I cannot get it to work.  I thought it might 
> be 
> > an issue with the browser cache settings, but, again, no matter what I 
> try 
> > I get the same result.
> > 
> > I've included a test script and page template that demonstrates this 
> > problem. When I go to url "sessionCreateAndRedirect?sessionText=123", I 
> > get the message, "Problem: no session object (redirectTest)."  If I then 
> 
> > refresh the browser, I get "123" displayed, which is the correct 
> response. 
> >  Subsequent calls to the url with different values for sessionText 
> returns 
> > the previous session value, until I do a browser refresh.
> > 
> > Any assistance, guidance, wisdom, etc. on this matter would be greatly 
> > appreciated.
> > 
> > 
> > ## Script (Python) "sessionCreateAndRedirect"
> > ##parameters=sessionText
> > ##
> > session = context.REQUEST.SESSION
> > sessionObjName = 'redirectTest'
> > session.set(sessionObjName, sessionText)
> > return 
> > 
> context.REQUEST.RESPONSE.redirect(context["view_session_obj.pt"].absolute_url())
> > 
> > ## Page Template "view_session_obj.pt"
> > ##
> > <html>
> >   <head>
> >     <title tal:content="template/title">The title</title>
> >   </head>
> >   <body>
> >     <tal:block define="global sesObj request/SESSION/redirectTest | 
> > nothing"></tal:block>
> >     <p tal:condition="not:sesObj">Problem: no session object 
> > (redirectTest).</p>
> >     <p tal:condition="sesObj" tal:content="sesObj">session obj 
> > contents</p>
> >   </body>
> > </html>
> > 
> > 
> > Brad
> 
> 
> 
> 