Hi,

I've got an issue that "Vary" header is repeated twice in response when
"gzip_vary on" is specified in config file;

My configuration is the following:
Two instances of nginx are running on different hosts (A and B)
There is
location /smth/ {
proxy_pass http://B/smth;
}

and
gzip_vary on;
in config for host A.

B adds "Vary: Accept-Encoding" in response for http://B/smth

And then if http://A/smth request is performed "Vary" header is returned
twice in response.
< Connection: keep-alive
< Vary: Accept-Encoding
< Vary: Accept-Encoding
< date: Tue, 01 Apr 2014 10:02:27 GMT
< expires: Tue, 01 Apr 2014 10:07:27 GMT
< server: nginx/1.4.4


Could you please help me to resolve this problem? Is it known issue or it
is normal behaviour or may be something wrong on my side?

Thanks,
BR/ Yury
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