[mod_python] sending headers directly to the client

First explain what is so special about your request that you cannot just 
send out regular data and have to delay sending the response headers?

Awaiting your reply - could a simple (periodic) redirect solve your problem?


Mike Looijmans
Philips Natlab / Topic Automation


Stefan Wehr wrote:
> Hi all,
> 
> I need to send headers directly to the client; that is, before
> mod_python sends its headers (I know that I have to handle the status
> line specially).
> 
> Background: I need to detect when the user hits the 'Cancel' button of
> the browser. The only reliable way to do this seems to send something
> periodically to the client. My idea is now to send dummy headers to
> the client until the possibly long running HTML code generating
> function is finished. Then I stop sending dummy headers and send the
> HTML code to the client. If the client hits 'Cancel' while the
> HTML code generating function is running, I'm able to detect this
> because I get some kind of error when sending a dummy header.
> 
> The problem is now: how can I send the dummy headers?
> 
> I cannot use 'req.write' because this flushes all headers (note that
> some headers can be set only *after* HTML has been generated).  My
> idea was then to use 'req.connection.write'. The problem with this
> approach is that this function does *not* trigger an error if the
> connection is closed. I also fiddled around with the
> 'req.connection.aborted' field without success.
> 
> Any help would be greatly appreciated.
> 
> Cheers, Stefan
> 
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