Return an edn-parser fn that, given a request, will read the body of that
request with `edn/read`. options are key-val pairs that will be passed as a
hash-map to `edn/read`.

Return a json-parser fn that, given a request, will read the body of that
request with `json/read`. options are key-val pairs that will be passed along
to `json/read`.

Return a transit-parser fn that, given a request, will read the
body of that request with `transit/read`. options is a sequence to
pass to transit/reader along with the body of the request.

Return a map of MIME-type to parsers. Included types are edn, json and
form-encoding. parser-options are key-val pairs, valid options are:

  :edn-options A hash-map of options to be used when invoking `edn/read`.
  :json-options A hash-map of options to be used when invoking `json/parse-stream`.
  :transit-options A vector of options to be used when invoking `transit/reader` - must apply to both json and msgpack

Examples:

(default-parser-map :json-options {:key-fn keyword})
;; This parser-map would parse the json body '{"foo": "bar"}' as
;; {:foo "bar"}

(default-parser-map :edn-options {:readers *data-readers*})
;; This parser-map will parse edn bodies using any custom edn readers you
;; define (in a data_readers.clj file, for example.)

(default-parser-map :transit-options [{:handlers {"custom/model" custom-model-read-handler}}])
;; This parser-map will parse the transit body using a handler defined by
;; custom-model-read-handler.

Take a request and parse its body as edn.

Take a request and parse its body as a form.

Take a request and parse its body as json.

Take a request and parse its body as transit.