the $upstream_addr variable is empty when enable keepalive

[kindy]

hi,

from nginx 1.1.13 to 1.2.0.
the conf:

upstream a {
    server 127.0.0.1:8083;
    keepalive 10 single;
}
server {
    listen       8083;
    keepalive_timeout 10;

    location = /a {
    }
    location = /b {
        proxy_http_version 1.1;
        proxy_set_header Connection keep-alive;
        add_header upname "abc[$upstream_addr]dd";
        proxy_pass http://a/a;
    }
}

- - - - - - - - -
$ touch html/a

$ curl -i localhost:8083/b
HTTP/1.1 200 OK
Server: nginx/1.2.0
Date: Thu, 26 Apr 2012 02:07:12 GMT
Content-Type: application/octet-stream
Content-Length: 0
Connection: keep-alive
Last-Modified: Thu, 26 Apr 2012 02:01:02 GMT
Accept-Ranges: bytes
upname: abc[127.0.0.1:8083]dd

$ curl -i localhost:8083/b
HTTP/1.1 200 OK
Server: nginx/1.2.0
Date: Thu, 26 Apr 2012 02:07:12 GMT
Content-Type: application/octet-stream
Content-Length: 0
Connection: keep-alive
Last-Modified: Thu, 26 Apr 2012 02:01:02 GMT
Accept-Ranges: bytes
upname: abc[]dd



-- 

林青(Kindy Lin)
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