download ZIP files are corrupted in IE but not in Firefox

Question

I´m trying to download ZIPs
http://www.ibge.gov.br/concla/pub/revisao2007/PropCNAE20/CNAE20_Subclasses_EstruturaDetalhada.zip
http://www.ibge.gov.br/concla/pub/revisao2007/PropCNAE20/CNAE20_EstruturaDetalhada.zip

Are XLS files inside the ZIP

In IE8/Win7x64 and XPSP3/IE7 the files are downloading corrupetd but in Firefox 2 and 3 everything is OK and the downlaods are 100% valid

Using fiddler2 i cannot see anything strange, only a chunked encoding and in "raw" mode the PK signature does not appears in the file structure

In IE6 there is an known hotfix

I´m behind a FortiGate 310B (Foertinet.com) and i´ve enabled  feature called chunkedbypass but makes no diff, AV and WebFilter are not intercepting the request

Answer 1

Hi,

Do you have the fully qualified uri's. The url's are for folders in which no default start page has been set.

When you navigate to those folders the first response back should be the default pages' markup content. I am getting the Download prompt from a 200 response which is unexpected if the default page had been set.

Regards.

---

Rob^_^

Answer 2

I am having the same problem (Win7 x64 IE .zip are corrupt but same one downloaded with Firefox 3 are fine).

Has anyone found a cause or solution for this?

Answer 3

This is months later but I thought I'd post a solution anyway.

The problem is because your Content-Encoding is gzip. IE will not decompress the response if the Content-Type is application/zip. I ended up turning off compression for all zip files and it works now.

Hope that helps!

 

Answer 4

How? IN the Server? IN the Client?

Answer 5

This indeed works. I was Content-Encoding my javascript using gzip via my htaccess. As soon as I stopped gzip encoding on the site, the content-type application/zip responses wroked fine. Thanks for the post!!!

Answer 6

It's a server-side setting.  For further reading, look up the "Accept-Encoding" HTTP header.

Answer 7

You may recover corrupted .zip files owing to program below

http://www.zip.fixtoolbox.com 

software supports restoring .zip archives more than 2GB