Sending zipped files as attachments

I have a rails application that creates a couple of csv file, zips
them up and sends them to the client as an attachment(for download)
using this line:

send_file t.path, :x_sendfile => true, :type => 'application/
zip', :filename => "invited_friends_stats.zip"
When I view the zipped file created on the server, I'm able to use it,
however, when I download the file through the application, it
uncompresses into a .zip.cpgz file, while in turn compresses into a
zip file which compresses into a .zip.cpgz file, etc, etc.

I then downloaded "The Unarchiver" app (on Mac OSX) and when I try and
open the .zip file I get an error: "the contents cannot be extracted
with this program"

Does anyone have any idea why this is happening? Encoding error, etc?
Is there something I'm missing from the line above, or in my
configuration that would fix this?

bertly_the_coder wrote in post #1044365:

I have a rails application that creates a couple of csv file, zips
them up and sends them to the client as an attachment(for download)
using this line:

send_file t.path, :x_sendfile => true, :type => 'application/
zip', :filename => "invited_friends_stats.zip"
When I view the zipped file created on the server, I'm able to use it,
however, when I download the file through the application, it
uncompresses into a .zip.cpgz file, while in turn compresses into a
zip file which compresses into a .zip.cpgz file, etc, etc.

What is .zip.cpgz?

I then downloaded "The Unarchiver" app (on Mac OSX) and when I try and
open the .zip file I get an error: "the contents cannot be extracted
with this program"

I don't know why you would need this app. Mac OS X, at least any
reasonably recent version, natively understands the .zip file format.
These can typically be expanded by double-clicking them in Finder.

Does anyone have any idea why this is happening? Encoding error, etc?
Is there something I'm missing from the line above, or in my
configuration that would fix this?

What did you use to compress the file server-side? My first guess is
that the file is in some unsupported .zip format. It's also possible
that the browser is trying to do some weird interpretation of the file.
Are you sure your server is properly informing the browser of the
correct content-type (mime-type)? I mean I see that you have specified
that in your send_file, but did you actually look at the response in the
browser to be sure? If you're using a WebKit based browser you can see
that information using the Web Inspector. If using FireFox there's
Firebug.

As far as I know Mac OS X should support standard zip (content-type:
application/zip) or GNU ZIP (content-type: application/x-gzip), and
probably some others as well. But, if you stick to one of those two you
should be fine.

I would also compare the file that was compressed on the server with the
file downloaded via the browser. If you run the two of them through a
SHA1 you'll be able to tell if the file is arriving intact.

$ openssl dgst -sha1 MyZip.zip
SHA1(Untitled.rtf)= 17388cb38afe3d0f36a086458c96e334d6ec7e2c

Run something like that against the file on the server and the one
downloaded through the browser. If the hashes match you know you're not
getting corruption over the wire.

you should try to use pony gem. I have tested to send mail with pdf files as attachment.

Yup! My question exactly, what is .zip.cpgz and why is it showing up.

It's just a browser attachment Anand, no mail invovled.

I know this is an old thread, but did you ever find a solution? I'm
having an identical issue with Rails sending a zip file!