[web] Cookie "lag"
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Key: LABS-379
URL: https://issues.apache.org/jira/browse/LABS-379
Project: Labs
Issue Type: Bug
Components: Magma
Affects Versions: Current
Reporter: Simone Gianni
Assignee: Simone Gianni
Fix For: Current
A cookie is sent to the browser, and the browser send it back to the server on
the next request.
This has created a difference in cookie handling when compared to other "state"
variables. If a web app writes something in the session, and the reads it back,
it will obtain the latest written value. On the opposite, if the application
writes a cookie, it will still read the "old" (potentially missing) cookie
untile the next request.
IMHO this approach impairs cookie usage. Think for example about storing in a
cookie the preferred user language. When the user clicks on a language, the
corresponding handler will set a cookie, then other components will read that
cookie if present to present their contents in the right language. This works,
except in the same request the user clicked on the language, so you have to
store the new language BOTH as a cookie and as something else (like session or
request attribute) and then multiply checks along the code, which makes it
complex for no real reason.
The situation where you really want to compare en incoming cookie with an
outgoing one is quite rare.
So, it would be better to mask this cookie peculiarity, which is an
implementation side effect, and have cookies behave like "remote session
attributes".
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