if you trigger an ajax request, if it's a GET (an idempotent method) you
may avoid reloading the page and get back a 304....................but it's
not handled automatically by web2py unless the content is static.
On Thursday, August 7, 2014 7:52:30 AM UTC+2, mweissen wrote:
>
> Dave told me that my explanation was not clear. Let me try it in other
> words. What I want is a program which periodically reloads a page (I think
> using LOAD is the best way), but only if I allow it.
>
> My idea was that the header parts "Last-Modified" and/or "ETag" could do
> the job. Therefore I wrote the program in two steps:
>
> (1) A controller without any response header modification. It shows the
> actual time and reloads once a second - everything is fine.
>
> The functions:
>
> def mytime():
> jetzt=str(request.now)[:19]
> return dict(jetzt=jetzt)
>
> def init():
> return dict()
>
> -------------------------
>
> The views:
>
> mytime.load:
> {{=jetzt}}
>
> init.html:
> {{extend 'layout.html'}}
> {{=LOAD(f="mytime.load", ajax=True, timeout=1000, times="infinity")}}
>
>
>
> (2) Now I want to simulate an unchanged page. Anthony wrote on
>
> http://stackoverflow.com/questions/14515313/how-to-modify-web2py-download-function-to-return-304-not-modified-in-case-the
>
> how to change the header. I add the response.headers-lines with a *constant
> *"Last-Modified" time and/or a *constant *"ETag" (I think every value is
> allowed here). My hope has been that these modifications *would prevent a
> reload* of the page. If this would be correct I would always see the same
> time. But it did not work, regardless of the header modifications the page
> reloads again once a second.
>
> def mytime():
> jetzt=str(request.now)[:19]
> mtime = "Mi, 06 Aug 2014 08:11:00 GMT" # always the same time!
>
> *response.headers['Last-Modified'] = mtime*
>
> * response.headers['Pragma'] = 'cache' response.headers['Cache-*
> *Control'] = 'private' response.headers['ETag'] = "123" # any value,
> constant*
> return dict(jetzt=jetzt)
>
>
> My primary problem is: the LOAD helper (or an other command?) asks the
> server periodically if there is a new content - and the server should
> reload the page under program control.
>
> Is it possible to solve it using the response headers?
>
> The purpose of the request.now call is only to show whether the page
> reloads or not.
>
> Regards, Martin
>
> -
>
--
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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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