replaceHeader :: H.HeaderName -> HeaderValue -> H.ResponseHeaders -> H.ResponseHeaders
replaceHeader k v hdrs = (k,v) : deleteBy ((==) `on` fst) (k,v) hdrs
replaceHeader :: H.HeaderName -> HeaderValue -> H.ResponseHeaders -> H.ResponseHeaders
replaceHeader k v hdrs = (k,v) : deleteBy ((==) `on` fst) (k,v) hdrs
replaceHeader k v hdrs = (k,v) : deleteBy ((==) `on` fst) (k,v) hdrs