I think you should use official site.
http://nginx.org/en/docs/http/ngx_http_proxy_module.html
What is your proxy_cache_methods value?
--- Original message ---
From: "Jeroen Ooms" <jeroen.ooms@stat.ucla.edu>
Date: 25 January 2014, 01:34:11
> Is it possible to cache the OPTIONS method? This pages gives exactly
> that example: http://www.packtpub.com/article/nginx-proxy
>
> proxy_cache_methods OPTIONS;
>
> However, when I try this, nginx writes in the error log:
>
> [warn] 7243#0: invalid value "OPTIONS" in ...
>
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