envoyproxy/envoy

Accessing request headers in envoy_on_response (lua HTTP filter).

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#4613 aperta il 5 ott 2018

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Descrizione

I'm trying to use a lua HTTP filter to set a response header whose value depends on a request header.

As a simple example, suppose we want to copy a header from the request to the response. How can we do this using a lua filter?

Maybe we can store the request header in a "global" table during envoy_on_request and read it later when envoy_on_response is called. However, even if this approach makes sense, how can we correlate responses with requests to be able to do this?

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