filter to modify upstream response before it is cached

[Roger Fischer]

Hello,

is there a hook into the nginx processing to modify the response body (and headers) before they are cached when using with proxy_pass?

I am aware of the body filters (http://nginx.org/en/docs/dev/development_guide.html#http_body_filters <http://nginx.org/en/docs/dev/development_guide.html#http_body_filters>), running before the response is delivered to the client. But I would prefer to run the filter just once, when the upstream response is cached.

I am assuming, if nginx does not offer such a hook, OpenResty will not be of any help either.

Thanks…

Roger

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