I thought so,
I had to modify mydownload so browsers do client-side caching,
speeding up the web-page load:
def fast_download():
# very basic security:
if not request.args(0).startswith("sponsor.logo"):
return download()
# remove/add headers that prevent/favors caching
del response.headers['Cache-Control']
del response.headers['Pragma']
del response.headers['Expires']
filename = os.path.join(request.folder,'uploads',request.args(0))
response.headers['Last-Modified'] = time.strftime("%a, %d %b %Y
%H:%M:%S +0000", time.localtime(os.path.getmtime(filename)))
return response.stream(open(filename,'rb'))
TODO: handle If-Modified-Since (returning 304 if not modified), but as
you said, let the browser do that if so much performance is needed (so
far, fast_download is working fine for me now :-)
Thanks very much for your help, and please let me know if there is
anything wrong with this approach,
Best regards,
Mariano Reingart
http://www.web2py.com.ar
http://www.sistemasagiles.com.ar
http://reingart.blogspot.com
On Tue, May 4, 2010 at 10:23 PM, mdipierro <mdipie...@cs.depaul.edu> wrote:
> caching downloads does not make sense. This is because the role of
> download is to check permissions to download a file (if they are set).
> if you cache it then you do not check. If you do not need to check do
> not use download. Use
>
> def mydownload():
> return
> response.stream(open(os.path.join(request.folder,'uploads',request.args(0)),'rb'))
>
> or better use the web server to download the uploaded files.
>
> On May 4, 6:11 pm, Mariano Reingart <reing...@gmail.com> wrote:
>> To cache images, I'm trying to do:
>>
>> @cache(request.env.path_info,60,cache.ram)
>> def download(): return response.download(request,db)
>>
>> But seems that is not working:http://www.web2py.com.ar/raf10dev/default/index
>> (see images at sidebar, if you quickly reload pages, they fail)
>>
>> The book says something about response.render, but nothing about download...
>> Anyway, I'm not sure if this is a good use of @cache, are there any other
>> way ?
>>
>> BTW, why Cache-Control: no?...
>>
>> Best regards,
>>
>> Mariano Reingarthttp://www.sistemasagiles.com.arhttp://reingart.blogspot.com
>
