Apache's proxy module is fixed in Apache version 1.3.31 (or possibly slightly earlier), so this is no longer a problem. (The changes are in src/modules/proxy/proxy_cache.c) By ZOPE 2.7.1, the Image object no longer sets Content-Length for a 304 response. Steven Steven Hayles wrote:

Adding 2 lines to lib/python/App/ImageFile.py seems to fix it

import stat RESPONSE.setHeader('Content-Length', os.stat(self.path)[stat.ST_SIZE])

Here's a diff:

--- ImageFile.py.orig Tue Feb 11 17:17:04 2003 +++ ImageFile.py Mon Jun 28 11:42:38 2004 @@ -16,6 +16,7 @@

import os import time +import stat

from App.config import getConfiguration from OFS.content_types import guess_content_type @@ -82,6 +83,7 @@ last_mod = long(0) if last_mod > 0 and last_mod <= mod_since: RESPONSE.setStatus(304) + RESPONSE.setHeader('Content-Length', os.stat(self.path)[stat.ST_SIZE]) return ''

f=open(self.path,'rb')

Steven Hayles wrote:

...

I think I'm seeing a bug in the 304 handling of Apache or ImageFile (as used by misc_ and p_ images such as /p_/pl the plus in a box). I have Apache working as a proxy/cache in front on ZOPE. Everything is fine until I perform a forced refresh on one of these images. ZOPE replies to Apache with a 304 status but with a Content-length header of 0. From then on, Apache serves a zero length image.

The code for FSImage and Image sets the Content-length header to the length of the data that would have been sent. Image has the comment:

# Set header values since apache caching will return Content-Length # of 0 in response if size is not set here

Does the code for ImageFile need to do similarly, or do I just need a later version of Apache?

Thanks

Steven

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