AcceptEncoding

parses Accept-Encoding headers and performs server-side content coding negotiation (RFC 9110 §12.5.3). Accept-Charset has no counterpart here: RFC 9110 §12.5.2 deprecates it.

negotiate

defn

(Fn [(Ref String a), (Ref (Array String) b)] (Maybe String)) 

                        (negotiate accept offers)

selects the best content coding to serve from offers given an Accept-Encoding header value, per RFC 9110 §12.5.3, as (Maybe String). A coding named by the field takes that entry's weight, one only * matches takes the wildcard's, and any other coding is unacceptable — except identity, which is acceptable at full weight unless the field rates it. A weight of 0 makes a coding unacceptable rather than least preferred. The highest-weighted acceptable offer wins, ties broken by the order of offers; matching is case-insensitive. An empty Accept-Encoding accepts only identity; a request that sends no Accept-Encoding at all accepts anything, which Request.negotiate-encoding handles. Nothing means nothing is acceptable.

parse

defn

(Fn [(Ref String a)] (Array Weighted)) 

                        (parse s)

parses an Accept-Encoding header value into its weighted content codings, in header order.