'''Syntax:'''	'''gzip_proxied''' off | expired | no-cache | no-store | private | no_last_modified | no_etag | auth | any ...
'''Default:'''	''off''
'''Context:'''	http server location
'''Reference:'''	[http://nginx.org/en/docs/http/ngx_http_gzip_module.html#gzip_proxied gzip_proxied]