Package: ikiwiki
Version: 3.20100815.7
When clicking the "Submit" or "Preview" button on the IkiWiki online
edit form, I
get an HTTP 500 response; the Apache logs on the server show:
[client XXX] malformed header from script. Bad
header=according%20to%20the%20availab: ikiwiki.cgi
Capturing the output from `ikiwiki.cgi`, I see that just these two
lines are sent:
Status: 302 Found
Location:
https://ocikbapps.uzh.ch/gc3wiki/ikiwiki.auth.cgi?_submitted=1;do=edit;..;_submit=Preview;attachment=
(This HTTP 302 content is then sent as body of the HTTP 500 reponse.)
The total size in bytes of the reply sent by `ikiwiki.cgi` is 16189; I
thought this might be an issue with Apache imposing some limit on the
header size; indeed, as of Apache 2.2.16-6 (squeeze), when dealing
with the HTTP responses generated by CGI scripts, the code from
`server/util_script.c` applies: (function
`ap_scan_script_header_err_core`, lines 403--433)
char x[MAX_STRING_LEN];
char *w, *l;
[...]
if (buffer) {
*buffer = '\0';
}
w = buffer ? buffer : x;
[...]
while (1) {
int rv = (*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data);
where `MAX_STRING_LEN` is defined in `httpd.h` to be equal to
`HUGE_STRING_LEN`, that is, 8192.
I am unsure whether this issue should be attributed to IkiWiki or Apache.
The same issue (with a CGI-side fix) is discussed here:
https://bugzilla.mozilla.org/show_bug.cgi?id=513989
I'm using Debian squeeze, with the latest updates.
$ dpkg -l {ikiwiki,apache\*} | grep ^i
ii apache2 2.2.16-6+squeeze1
Apache HTTP Server metapackage
ii apache2-doc 2.2.16-6+squeeze1
Apache HTTP Server documentation
ii apache2-mpm-prefork 2.2.16-6+squeeze1
Apache HTTP Server - traditional non-threaded model
ii apache2-utils 2.2.16-6+squeeze1
utility programs for webservers
ii apache2.2-bin 2.2.16-6+squeeze1
Apache HTTP Server common binary files
ii apache2.2-common 2.2.16-6+squeeze1
Apache HTTP Server common files
ii ikiwiki 3.20100815.7
a wiki compiler
Thanks!
Riccardo
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