lose value of $uid_set

[youjie zeng]

Hello, master of nginx, I have a question when using
ngx_http_userid_module. here is the detail description:

nginx version:1.7
conf:

log_format  main '$remote_addr - $remote_user [$time_local] "$request"
$uid_set'
...

server {

        userid on;

        userid_name user_id;

        set $uid_reset myuid;

           ...

}


because i set $uid_reset not empty, $uid_set would get a new uuid every
time nginx process a request.

but i found some strange things, I got value "-" of $uid_set, that means
$uid_set did not get a value. even though over 92% request have correct
value of $uid_set, but the 2% do not. And i did not found abnormal of those
request.

Do you have any idea about this?

looking forward your reply!

have a nice day!
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