Hi, I ran in to a small bug just now.

PROBLEM: curl remembers the value of the previous %{redirect_url} and outputs
it for every consecutive write-out even though no redirect was made for those
requests.

DESCRIPTION: curl is run via a conf file as below where the directory upload/
exists at the remote host but foo/ and bar/ does not. The request to "upload"
lacks a final slash and will thus be redirected to http://192.168.111.2/upload/
via a Location header and this redirect URL will be present in the
%{redirect_url} on write-out. This variable is not purged between requests and
is therefore shown for upcoming requests as well.

    # test.conf
    silent
    write-out = "%{http_code}\t%{size_download}\t%{num_redirects}\t%{url_effective}\t %{redirect_url}\n"

    output = 200
    url = http://192.168.111.2/foo
    output = 200
    url = http://192.168.111.2/bar
    output = 200
    url = http://192.168.111.2/upload
    output = 200
    url = http://192.168.111.2/foo
    output = 200
    url = http://192.168.111.2/bar

Here's an example:

$ curl --config test.conf
404 320 0 http://192.168.111.2/foo
404 320 0 http://192.168.111.2/bar
301 355 0 http://192.168.111.2/upload http://192.168.111.2/upload/
404 320 0 http://192.168.111.2/foo http://192.168.111.2/upload/ <-- here
404 320 0 http://192.168.111.2/bar http://192.168.111.2/upload/ <-- and here
$ tail /var/log/apache2/access_log
192.168.111.2 - - [19/Nov/2009:11:12:56 +0100] "GET /foo HTTP/1.1" 404 320 "-" "curl/7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10"
192.168.111.2 - - [19/Nov/2009:11:12:56 +0100] "GET /bar HTTP/1.1" 404 320 "-" "curl/7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10"
192.168.111.2 - - [19/Nov/2009:11:12:56 +0100] "GET /upload HTTP/1.1" 301 355 "-" "curl/7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10"
192.168.111.2 - - [19/Nov/2009:11:12:56 +0100] "GET /foo HTTP/1.1" 404 320 "-" "curl/7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10"
192.168.111.2 - - [19/Nov/2009:11:12:56 +0100] "GET /bar HTTP/1.1" 404 320 "-" "curl/7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10"
$ uname -a
Linux er 2.6.28-11-server #42-Ubuntu SMP Fri Apr 17 02:48:10 UTC 2009 i686 GNU/Linux
$ curl -V
curl 7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10
Protocols: tftp ftp telnet dict ldap ldaps http file https ftps
Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz

Cheers and thanks for a great tool!

-- 
Stefan Pettersson
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