duplicate Vary: Accept-Encoding header

Makailol Charls makailol7 at gmail.com
Mon Jan 20 04:54:03 UTC 2014


I use nginx/1.4.4 with gunzip = on and gzip_vary = on. This leads to a
duplicate Vary Header.

gzip_vary should do nothing if the header is already present:

moki at mysrv:~$ curl -I<>
HTTP/1.1 200 OK
Server: nginx/1.4.4
Date: Sun, 19 Jan 2014 11:30:59 GMT
Content-Type: text/html
Connection: keep-alive
Vary: Accept-Encoding
Vary: Accept-Encoding
Location: home.html

I have no control of the upstream server it may send a Vary header or not,
in order to be safe I would like to use gzip_vary = on in order to prevent
any problems here.

This issue is in standard ngx_http_header_filter_module so can anyone
suggest solution?

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