get a variable value in my module

[michalkraus]

Hello,

I have problem with getting the value of a variable from nginx conf file
in my module - $arg_u. 
Code in my module seems like:

{ ngx_string("ap_filter_sessionid"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_ap_filter_loc_conf_t, sessionid),
NULL },

There is string "$arg_u" in the variable sessionid in
ngx_http_ap_filter_loc_conf_t struct and not the read value of the
variable. I went through some module codes and I found out that I should
write my function instead of ngx_conf_set_str_slot directive. I tried to
write it, but it has never worked. What should be in this function. 

Thanks a lot in advance.

Michal

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,167851,167851#msg-167851