[mod_python] Strange caching problem

Simon Willison cs1spw at bath.ac.uk
Wed Aug 27 22:51:32 EST 2003

I'm experimenting with the idea that mod_python stays resident in 
memory. Here's the handler script I'm using:

from mod_python import apache

counter = 0

def handler(req):
     req.content_type = 'text/html'
     global counter
     counter = counter + 1
     req.write("Counter: %d" % counter)
     return apache.OK

If I load it up in a browser and continuously hit refresh, the number 
only increments every 4 or 5 page loads. I was expecting it to increment 
each time. Don't worry - this isn't how I intend to implement a page 
counter, it's just an experiment I'm using to try and gain a better 
understanding of this capability.

The above problem is unsevere, but I've also been having issues with the 
following script:

from mod_python import apache

def handler(req):
     req.content_type = 'text/html'
     req.write('unparsed_uri: %s' % req.unparsed_uri)
     return apache.OK

When I visit the following URL:


It displays this, as expected:

unparsed_uri: /~simon/1

If I then visit the following:


It continues to show the same string. I have to hit enter in my 
browser's location bar several times before it will notice that I've 
entered a different URL.

This is a major problem, as my aim is to serve up different content 
depending on the URL. If the system isn't noticing the different URLs 
for some reason it becomes unusable!



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