envoyproxy / envoyproxy/envoy

Option to process header values in HeaderKeyFormatter extensions

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area/http enhancement no stalebot
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Description

*Title:* Option to process header values in HeaderKeyFormatter extensions

*Description*:

We would like to write a HeaderKeyFormatter extension. We also care about some headers' values as seen by the codec.

This is not possible to reconstruct today as inline "multiple-message" header values are concatenated when added to the header map, so it's not possible to see their original format.

To make this possible, I would like to modify the existing HeaderKeyFormatter interface so that it takes a header value as well.

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