Set header based on memcached request - mod_eval

Hi all,

I try to set a HTTP header for a proxy request based on some variable I
get from memcached with the eval module:

location / {
eval $role {
set $memcached_key $cookie_sessionid;
proxy_set_header X-Role $role;

I can see the memcached request, however the HTTP requests to the nginx
server just hangs for some seconds and no proxy request is done to the
backend server.

Any ideas?

nginx -V

nginx: nginx version: nginx/1.0.4
nginx: built by gcc 4.1.2 20080704 (Red Hat 4.1.2-50)
nginx: TLS SNI support disabled
nginx: configure arguments: --user=nginx --group=nginx
–prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx
–pid-path=/var/run/ --lock-path=/var/lock/subsys/nginx
–with-http_secure_link_module --with-http_random_index_module
–with-http_ssl_module --with-http_realip_module
–with-http_addition_module --with-http_sub_module
–with-http_dav_module --with-http_flv_module
–with-http_gzip_static_module --with-http_stub_status_module
–with-http_perl_module --with-mail --with-mail_ssl_module
–with-cc-opt=’-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386
-mtune=generic -fasynchronous-unwind-tables’ --with-ipv6 --with-file-aio



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