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This commit harmonizes the `HeadersAdapter` implementations across all supported servers with regards to the `get(Object key)` contract; some server implementations are not sticking to a `Map`-like contract and return empty `List` instead of `null` when a header is not present. This also fixes the `size()` implementations to reflect the number of header keys, as some implementations consider multiple values for the same header as different entries. Issue: SPR-17396