I'm currently working on modifying a php based application into an apache
module.
The short of it is that I want to send a Location header with a 0 content
length message and headers for cache-control and pragma.
Setting the headers, and returning HTTP_MOVED_TEMPORARILY the additional
headers are stripped and the default message is sent.
Using ErrorDocument in my httpd.conf to use a 0 length file, the content
length is correctly set to 0, but even the Location header gets stripped.
I am pretty sure the cause of my issue is unrelated to the additional
headers, just needing me to send no content which is confusing the problem
handsets. How can I cause this behaviour?
For anyone interested, the background of the situation, some source after
the background:
In addition to logging an access to an image, this module will redirect the
request based on some parameters to a different server. The php version
would send Location, pragma: no-cache, cache-control: no-cache,
must-revalidate and 0 content length, which worked perfectly for all
clients.
Within the module I have set the location header as well as the pragma and
cache-control, however only the location will go through, and the default
302 message is sent. This is not generally a problem, except for with one of
the local mobile phone handset manufacturers which fails to redirect the
image correctly claiming a bad image.
Thus I am attempting to emulate the behaviour of the php, being unsure of
which part is causing the problem. Most likely it would be the content being
sent confusing the handset. Honestly I'd like to just ignore the particular
manufacturer, but this is not an option.
Some source(stripped down to the essentials... In the actual version there's
error handling and whatnot):
curl_easy_setopt(hCurl, CURLOPT_URL, adUrl); // url to get the redirect
location from
curl_easy_setopt(hCurl, CURLOPT_WRITEDATA, &outUrl);
curl_easy_setopt(hCurl, CURLOPT_WRITEFUNCTION, outUrlWrite);
if(curl_easy_perform(hCurl) == 0)
{
apr_table_setn(r->headers_out, "Location", outUrl);
}
r->content_type = CONTENT_TYPE_MOBILE;
apr_table_setn(r->headers_out, "Cache-Control", "no-cache,
must-revalidate");
apr_table_setn(r->headers_out, "Pragma", "no-cache");
curl_easy_cleanup(hCurl);
return HTTP_MOVED_TEMPORARILY;
