Lua Script replace header value

[Rama Rao]

When I am trying to update the existing header value with the following code

headers:add(key,value) - it does not update.

I had to call  headers::remove(key), before calling add to actually replace the value.

Based on the code of HeaderMap at https://github.com/envoyproxy/envoy/blob/master/source/common/http/header_map_impl.cc#L472, I am assuming that it is expected behavior.

Is that correct? or am I missing some thing here?

Thanks,

Rama

[Matt Klein]

This is an artifact of how Envoy deals with the O(1)/inline headers. (I'm guessing you are trying to modify one of them).

I agree this is confusing, especially from the Lua perspective. Can you open a GH issue on this? I will try to look at a way to make this less confusing, either via Lua API change or doc change.

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Matt Klein

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[Rama Rao]

Matt,

I am trying with ":authority" header. I have opened an issue https://github.com/envoyproxy/envoy/issues/2414.

Thanks,

Rama