Setting headers within process_headers function of module

Hi,

I am writing an "upstream" module to implement a custom protocol. I have
managed to get most of it working end to end by following the fastcgi
module code but am stuck at a problem that should be simple...

I need to set certain HTTP headers within the process_header function as
the upstream server does not speak HTTP. The two headers that I am most
interested in at this time are "X-Accel-Redirect" and "Content-Type"
(populated at different times depending upon content received from
upstream). The values of both headers are available in the function.

I have tried following the example at
http://wiki.nginx.org/HeadersManagement (substituting headers_out with
headers_in) with no luck, the output headers don't seem to change or
there is a math exception thrown when a nginx internal function is
performing a hash lookup. Looking at the fastcgi module it seems that
there might be some hash initialisation that is needed? I haven't been
able to figure this out.

Any help would be appreciated!

Regards,

Atul

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