WSGI question: reading headers before message body has been read

Ron Garret ron.garret at gmail.com
Sun Jan 18 21:25:45 CET 2009


On Jan 18, 11:29 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Ron Garret schrieb:
>
>
>
> > I'm writing a WSGI application and I would like to check the content-
> > length header before reading the content to make sure that the content
> > is not too big in order to prevent denial-of-service attacks.  So I do
> > something like this:
>
> > def application(environ, start_response):
> >     status = "200 OK"
> >     headers = [('Content-Type', 'text/html'), ]
> >     start_response(status, headers)
> >     if int(environ['CONTENT_LENGTH'])>1000: return 'File too big'
>
> > But this doesn't seem to work.  If I upload a huge file it still waits
> > until the entire file has been uploaded before complaining that it's
> > too big.
>
> > Is it possible to read the HTTP headers in WSGI before the request
> > body has been read?
>
> AFAIK that is nothing that WSGI defines - it's an implementation-detail
> of your server. Which one do you use?

Apache at the moment, with lighttpd as a contender to replace it.

rg




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