how to use proxy_set_header set Cookie

[yaoxinming]

I user a nginx to proxy a java web server,and want to add a cookie when
proxy the url,my config :


 location /el {
        proxy_set_header Cookie "mysession=$arg_ccvalue";
        proxy_pass   http://172.16.1.30:8080/trance;

        }
but i can get the cookie in my java web application

if anyone can give some advice?

thanks
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