-- | Obtain the last-presented header value for a given header key.
lookupLast :: ByteString -> MetadataMap -> Maybe ByteString
lookupLast k = fmap NE.last . lookupAll k
lookupLast :: ByteString -> MetadataMap -> Maybe ByteString
lookupLast k = fmap NE.last . lookupAll k
lookupLast k = fmap NE.last . lookupAll k