What is in a Request

The ring library converts the HTTP request into a clojure map, making it really easy to extract some or all of the values out of the request map.

ring parameters

The wrap-params middleware function adds support for url-encoded parameters.

URL-encoded parameters are the primary way browsers pass values to web applications. These paramters are sent when a user submits a form.

When applied to a handler, the parameter middleware adds three new keys to the request map:

  • :query-params - A map of parameters from the query string
  • :form-params - A map of parameters from submitted form data
  • :params - A merged map of all parameters

viewing ring parameters

You could write a function to simply display all the parameters as the body of the response. However Ring already provides a function to do this called handle-dump

To use the handle-dump function, first include the function in the namespace using (:require [ring.handler.dump :refer [handle-dump]])

Add the ring.handler.dump/handle-dump function into the shorturl-service.handler namespace along with other require statements

(ns shorturl-service.handler
  (:require [compojure.core :refer :all]
            [compojure.route :as route]
            [ring.middleware.defaults :refer [wrap-defaults site-defaults]]
            [ring.handler.dump :refer [handle-dump]]))

As we have multiple :require statements we can simply chain them all together as above.

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