nginx reports [upstream sent no valid HTTP/1.0 header] when used with varnish

[Joydeep Bakshi]

Hello all,

My setting works well  through nginx->apache but not through
nginx->varnish->apache

apache is configured to listen to port 8080 . when nginx uses

proxy_pass http://127.0.0.1:8080

the sites are running fine.

If I introduce varnish after nginx  by  [proxy_pass http://127.0.0.1:6082]
 the nginx starts throwing following error and browser also shows "*Zero
Sized Reply"*


[error] 17147#0: *207 upstream sent no valid HTTP/1.0 header while reading
response header from upstream

and /var/log/messages shows

varnishd[16984]: CLI telnet 127.0.0.1 42212 127.0.0.1 6082 Wr 101 Unknown
request.#012Type 'help' for more info.#012all commands are in lower-case.

varnishd[16984]: CLI telnet 127.0.0.1 42212 127.0.0.1 6082 Rd
Cache-Control: max-age=0

obviously varnish is configured to listen to apache

backend default {
        .host = "127.0.0.1";
        .port = "8080";
}

Can anyone please suggest the possible reason which is causing the problem ?
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