[Zope] Random Images: How to defeat the cache

[Small Business Services]

From: "Edward Pollard" <pollej at uleth.ca>
> I'm trying to make a quick and dirty random image product.
> 
> It is a zClass based off of OFS::Folder.
> 
> The index_html method is as follows:
> context.REQUEST.RESPONSE.setHeader( 'Cache-Control' ,'no-cache' )
> context.REQUEST.RESPONSE.setHeader( 'Pragma' ,'no-cache' )
> 
> image_set = []
> images = context.objectValues('Image')
> 
> for each in images:
>     image_set.append(each)
> 
> return_image = image_set[random.choice(range(0,len(image_set)))]
> return return_image.index_html(context.REQUEST,context.REQUEST.RESPONSE)
> 
> 
> This works fine as long as one shift-reloads the image. Otherwise it 
> does not change the image. Obviously my attempts to defeat the browser 
> cache are not succeeding.

Try adding setting the expiry time:

<meta http-equiv="expires" content="Sat, 01 Jan 2001 00:00:00 GMT">


HTH

Jonathan