How to pass custom header information in Redirect (Using C Module).

We have a custom Apche C module to trap the authentication and it
redirects all the protected Urls to a SSO java application. And I need
to pass additional information to the java application. What is the
best way of passing information from Apache to Java? I thought of
using http headers, but it doesn't appear to be carried over when I
use the REDIERCT status in apache module? Any help in this regard
would greatly appreciated.

Thanks,
- Rithwik.

On 26 Feb 2007 12:45:13 -0800
"Rithwik" <sudhar.suba@gmail.com> wrote:

> We have a custom Apche C module to trap the authentication and it
> redirects all the protected Urls to a SSO java application. And I need
> to pass additional information to the java application. What is the
> best way of passing information from Apache to Java? I thought of
> using http headers, but it doesn't appear to be carried over when I
> use the REDIERCT status in apache module? Any help in this regard
> would greatly appreciated.

A java application is most likely proxied, which is not the same
thing as a redirect.

But to answer the question in the subject line, when you redirect
from apache, the headers_out table is discarded (which is probably
your problem), but the err_headers_out table is preserved. Use it.

--
Nick Kew

Application Development with Apache - the Apache Modules Book
http://www.apachetutor.org/

On Feb 26, 1:40 pm, Nick Kew <n...@grimnir.webthing.com> wrote:
> On 26 Feb 2007 12:45:13 -0800
>
> "Rithwik" <sudhar.s...@gmail.com> wrote:
> > We have a custom Apche C module to trap the authentication and it
> > redirects all the protected Urls to a SSO java application. And I need
> > to pass additional information to the java application. What is the
> > best way of passing information from Apache to Java? I thought of
> > using http headers, but it doesn't appear to be carried over when I
> > use the REDIERCT status in apache module? Any help in this regard
> > would greatly appreciated.
>
> A java application is most likely proxied, which is not the same
> thing as a redirect.
>
> But to answer the question in the subject line, when you redirect
> from apache, the headers_out table is discarded (which is probably
> your problem), but the err_headers_out table is preserved. Use it.
>
> --
> Nick Kew
>
> Application Development with Apache - the Apache Modules Bookhttp://www.apachetutor.org/

Thanks for your response. But I use err_headers_out to populate the
Header.

Here is the code snippet I use:
apr_table_set(r->err_headers_out, "Location", redirect_address);
apr_table_set(r->err_headers_out, "ipaddr12", "12345");
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Req URL redirected
to %s", redirect_address);

return HTTP_MOVED_TEMPORARILY ;//OK; HTTP_MOVED_TEMPORARILY;

When I use the "OK" status, I see the custom header "ipaddr12". But
when I use other two redirects I don't see the header info.
FYI: The Location url is being proxied by mod_proxy.

I am having nightmare in getting this done. All I need is a mechanism
to pass some information from Apache module to java application. I
don't want to use the query parameters for obvious reasons. Finally if
passing info thru Header is not possible, I might need a code snippet
to pass it thru Cookie. Since I am a newbie to C and Apache, the code
to create and set cookie, would be greatly useful.

Thanks and greatly appreciate your help,
- Rithwik