[mod_python] Query about client server interaction

Tue Jan 21 09:08:16 EST 2003

Thanks Gregory,

I am just wondering if it is possible to do this with the publisher handler
- as that is what I am using at present as I have several python modules and
functions that I need to use?

Thanks again for all your help on this
Tim.

-----Original Message-----
From: Gregory Bond [mailto:gnb at itga.com.au]
Sent: 21 January 2003 00:28
To: Tim Parker (UK)
Cc: 'mod_python at modpython.org'
Subject: Re: [mod_python] Query about client server interaction 

> This is both a bit of understanding mod_python and also how CGI scripts in
> general work, basically I have a long running query which can take up to a
> minute or so to process, I want to return a page to the User immediately
> saying what it is doing, ideally I would like this page to get updated
> during the processing of the other operation.

Along with the other responses, I'd like to offer an alternative solution
(that may or may not work, depending on how the job is structured).

Anything you send to the client gets sent straight away, so you can use this
fact to write on-going status messages.  Something like this:

import time
from mod_python import apache

def handler(req):
    req.content_type = "text/html"
    req.write('''<html>
    <head><title>Example Delay Code</title></head>
    <body>
    Please wait.  This could take a long time!!!!
    <ul>
    ''')
    for i in range(20):
        time.sleep(2)
        req.write("<li> Still waiting.... %d\n" % i)
    req.write('</ul>\nAll Done!\n</body></html>')

    return apache.OK

(I've added this as FAQ 3.7.   Someone with more experience in redirects or
refresh tags can add some alternatives.).

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