curl extension downloads 1 byte only from zip files

**Andy Hassall** · Jul 17 '05, 01:50 PM

Re: curl extension downloads 1 byte only from zip files

On 12 Jul 2005 12:57:35 -0700, "benji" <benpjohnson@gm ail.com> wrote:
[color=blue]
>I have set up a system to download datafeeds in pain text or zipped.
>The download part of this system uses the curl extension to download
>the files.
>
>All was well when I tested it with various datafeeds in zipped and
>unzipped formats until I came to download zipped files from the
>affiliate program we are starting with.
>
>I have verified that the datafeeds download properly in Internet
>Explorer but interestingly they also fail in Firefox.
>
>Plain text files will download correctly from the same server with the
>curl script.
>
>Using curl to download a file results in a 1 byte file. Downloading
>with Firefox produces a 4kb corrupted zip file. I have tried multiple
>files all with the same result.
>
>A php script appears to be being used to create the zips on the fly?
>could this be the cause of the problem?[/color]

Minimal example code reproducing the problem?

Example URL?

First place to look would be the Content-type header.

--
Andy Hassall / <andy@andyh.co. uk> / <http://www.andyh.co.uk >
<http://www.andyhsoftwa re.co.uk/space> Space: disk usage analysis tool

**benji** · Jul 17 '05, 01:50 PM

Re: curl extension downloads 1 byte only from zip files

Thanks for the feedback it has helped my understanding of the problem.

Here is a cut down version of the code I am using. Sorry about omitting
the url I don't think the company would be impressed if I posted it in
a public forum.

I have also posted the responce headers below. I think that the
Content-Disposition: attachment; part is the key. I am guessing that
curl is downloading the result of the url (nothing) rather than the
file the headers are pointing to unfortunality I still cant seem to
find any relevent information that explains how curl handles this
situation.

-Ben

$ch = curl_init('url' );

$fp = fopen("download ed.zip", "w");

curl_setopt($ch , CURLOPT_BINARYT RANSFER, 1);
curl_setopt($ch , CURLOPT_FILE, $fp);

$downloaded = curl_exec($ch);

curl_close($ch) ;

fclose($fp);

HTTP/1.1 200 OK
Date: Tue, 12 Jul 2005 23:42:34 GMT
Server: Apache/2.0.46 (Red Hat)
Accept-Ranges: bytes
X-Powered-By: PHP/4.3.2
Set-Cookie: PHPSESSID=ddb9c 654715d488d3f60 36127b1d624d; path=/
Cache-Control: must-revalidate
Content-Length:
Content-Disposition: attachment; filename=awcsv. zip
Connection: close
Content-Type: application/zip

**Hilarion** · Jul 17 '05, 01:50 PM

Re: curl extension downloads 1 byte only from zip files

> Content-Length:

The problem might be in empty Content-Length header field.
You may signal this error to the company providing the data
this way.

Hilarion

**benji** · Jul 17 '05, 02:15 PM

Re: curl extension downloads 1 byte only from zip files

Thank you for your help with this problem I will add it to my support
ticket and see if they do anything about it.

Interestingly I have knocked up a solution using fsockopen which works
with the data, although I would still prefer to use curl as I am using
it for other parts of my application.

Best Regards

Ben

**Hilarion** · Jul 17 '05, 02:15 PM

Re: curl extension downloads 1 byte only from zip files

> Interestingly I have knocked up a solution using fsockopen which works[color=blue]
> with the data, although I would still prefer to use curl as I am using
> it for other parts of my application.[/color]

You may try using curl_setopt with CURLOPT_WRITEFU NCTION and writing
your own function handling data retrieval.

Hilarion

**benji** · Jul 17 '05, 02:15 PM

Re: curl extension downloads 1 byte only from zip files

Thanks for all your help Hilarion,

I will take a look at CURLOPT_WRITEFU NCTION

curl extension downloads 1 byte only from zip files

curl extension downloads 1 byte only from zip files

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