On Tue, 2002-02-05 at 20:29, Matt Feifarek wrote:
> | Well, you should do a loop on reading and flush it.
> |
> | I believe this gives a good example:
> | http://webware.colorstudy.net/twiki/bin/view/Webware/FileStreaming
> AndContentDisposition
>
> colorstudy.net seems to have fallen off of DNS. Actually, now that I think
> of it, it has been all day. Can you quickly explain what you mean by
> loop/flush? Thanks.
Arr.... Does anyone know of a place that does reliable, affordable DNS?
Anyway, you want to do something like:
self.response().setHeader('Content-type', 'application/whatever')
f = open(filename)
self.response().flush() # This turns on streaming
while 1:
value = f.read(4096)
if not value: break
self.response().write(value)
This way the file is streamed to the user immediately, and less memory
is used.
> | There's other tricks with local (or even remote) redirects that you can
> | do -- they'd perform better, and should be fine unless you want to
> | secure files.
>
> Any references for those tricks?
Well, you can just do a redirect (assuming there's a portion of your
site that is served as normal from the filesystem). I think if you set
the Status header correctly when you do a redirect, Apache will serve
the file you referred it to, but won't redirect the users browser. I'm
vague on it myself.
> If you're referring to my example, yeah, it's stupid (why send a gif or any
> other static file through a servlet) but what if you're building a pdf from
> a webkit servlet or some other dynamic thing.
>
> Another good example would seem to be stylesheets that modify themselves to
> browser-type or based on session or state or whatever.
All those tricks don't really apply to anything dynamic, even if it is
non-HTML. In those cases, you mostly use normal python and just write
out the results. I believe someone wrote something on dynamic PDF for
the Wiki though.
Ian
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