On Thu, 13 Sep 2007 13:01:23 -0600, Alain <alainb06(_at_)free(_dot_)fr> wrote:
- users preferences such as : preferred languages (or the http header
accept_language string, for internationalisation purpose)
- navigation items such as : referrer, history (tainted)
- computer environment : screen resolution, colour width, OS, browser,
initial canvas size, etc...
Whatever has been sent from the client to the server as part of the HTTP
header can easily be wrapped in an XML envelope and echoed back to the
client, the easiest of which is to use the document function to access a
URI who's only purpose is to echo back the header information which has
been parsed and XML'ized. Dependent upon the information you are looking
for, parsing the header string might be a faster task for client, or in
other words wrapping the entire text string in an XML envelope instead of
parsing it and returning each property in a separate
<property>value</property> element.
There are some other options: Using an onload event to trigger and
asynchronous call back to the server with the desired (property=value)*
accessed via Javascript which can then be cached as part of the client
session and returned with each subsequent request as part of the XML data
and/or as part of a request to a URI via the document function who's only
task is to return the cached XML data file for each session. The latter
will be the cheapest overall solution, though you will incur an additional
HTTP GET which could be avoided if the data was dynamically embedded with
each request.
It really is dependent on your server side resources. If they're limited,
the less dynamically generated content the better. If you're
underutilizing your available server side resources then embedding that
data with each subsequent request will provide a faster overall browsing
experience for your customers.
--
/M:D
M. David Peterson
http://mdavid.name | http://www.oreillynet.com/pub/au/2354 |
http://dev.aol.com/blog/3155
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