Patch: avoid multiple vary header entries

[Daniel Bornkessel]

Hi, 
while using nginx & varnish together we had problems when setting a 'Vary' header in our app when nginx is configured with 

gzip_vary  on;

as nginx's created response contain two 'Vary' header entries:

Vary: Accept-Encoding 
Vary: X-Special


however, several clients, including Varnish, don't understand this. Instead they need one header entry:

Vary: Accept-Encoding, X-Special

this is a patch that achieves this behavior. Is there any chance getting this patch into upstream?

Thanks


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