[Zope] zip files corrupted with IE when opened, fine when downloaded

robert rottermann robert at redcor.ch
Mon Mar 17 12:22:50 EDT 2008

thanks Jim
I'll try that


Jim Washington schrieb:
> Jim Washington wrote:
>> robert rottermann wrote:
>>> Hi there,
>>> we have a problem with an intranet that runs using plone 2.5.3
>>> when users using IE want to open a zip file from the intranet by using
>>> the "open" option from the download dialog they get winzip complaining
>>> that the file is corrupted.
>>> if they select "save" from the same dialog they can open the zip archive
>>> without problem.
>>> does anyone know a solution for this or give me an idea where to look
>>> for one?
>> I had a similar problem with pdf files, and googling indicated that IE
>> might be deleting the cached copy of the document before the opening
>> application can get to it.
>> I have had some success setting cache control to "private".  Something
>> like:
>> request.response.setHeader('cache-control','private')
>> "private,must-revalidate" may also be a good value, depending on your
>> situation.
> I Googled back through and found that the problem usually manifests when
> you have a 'cache-control':'no-cache' header.  The above explanation was
> not quite right.
> Anyway, either removing the "no-cache" header or using one that allows
> the local machine to keep a copy should work, if the problem is in fact
> a 'no-cache' header.
> - Jim Washington
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