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05.03.07
Dealing W/
Cookie-less Sessions
 By
Raymond Camden
Axel asked a question about Vista Gadgets that I thought I would
discuss here.
Sessions with MS Vista. I'm building a VISTA gadget calling
an external CFM page using flash forms. It looks really cool,
in particular in a flyout window.
Now when I need to log into the app, I realized that the VISTA
Gadget space seem not to have any session handler. Any idea?The
first thing you need to do is uninstall Vista. (No, I jest.)
So with knowing nothing about Vista Gadgets (frankly widgets
and gadgets bore me) I'd have to assume that they are acting
like a cookie-less browser.
ColdFusion sessions require cookies in order to track your browser
and associate it with a session... normally.
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If your browser doesn't support cookies, you have two ways you
can handle it.
All sessions come with a few default variables.
One of them is URLToken. This is a string of the form cfid=XXX&cftoken=XXX
(or cfid=xxx&cftoken=xxx&jsessionid=xxx). As you can
see, it is in a format appropriate for query strings.
This allows you to append it to the end of a link:
<a href="dharma.cfm?#session.urlformat#">Secret
Dharma File</a>
Another option is urlSessionFormat().
You can wrap your links with this function and ColdFusion will
determine if it needs to add the session information or not.
Here is an example of that:
<a href="#urlSessionFormat('dharma.cfm?')#">Secret
Dharma Files</a>
The important thing to note though is that all links have to
use one of these methods.
That means both "simple" links like I used above as well as
form tags.
It would also include AJAX links if the back end needs session
information in order to return the correct data.
Comments
About the Author:
Raymond Camden, ray@camdenfamily.com
http://ray.camdenfamily.com
Raymond Camden is Vice President of Technology for roundpeg,
Inc. A long time ColdFusion user, Raymond has worked on numerous
ColdFusion books and is the creator of many of the most popular
ColdFusion community web sites. He is an Adobe Community Expert,
user group manager, and the proud father of three little bundles
of joy. |
