Hi Ganesh,
The function called wrap-content-type takes in another function (handler)
and a content-type (string), and returns a function. The function that it
returns takes in a request, which is a Clojure map, that has the keys that
you see in the ring docs here:
https://github.com/ring-clojure/ring/wiki/Concepts#requests
That function that is returned, that takes in a request, is known as
middleware. It calls the handler passed into wrap-content-type, which is
another handler function (returns a ring response), then attaches the
content type passed into wrap-content-type to the headers of the ring
response. So the response might then look like {:headers {"Content-Type":
"application/json"}} (if "application/json" was passed as content-type),
along with whatever other keys/values were on the response before it was
passed into the function.
FYI, the #beginners channel of the Clojurians Slack is super helpful for
general questions like this.
Happy coding,
Brandon
On Sun, Dec 13, 2020 at 7:08 AM Ganesh Neelekani <ganeshneelek...@gmail.com>
wrote:
> Hello Team,
>
> I am a moderate Clojure user and now I planned to explore more Clojure, I
> used to
> write different functions every time where I could write asynchronous
> functions.
>
> As came from object-oriented background and trying to understand
> asynchronous functions
>
> I took some example on using fn functions
>
> ((fn [& nums] (/ (apply + nums) (count nums))) 1 2 3 4)
>
> In the above statement, 1 2 3 4 is added after the function defined as
> input,
> But in the below function I did not understand how fn behaves, what is the
> input for a request, Or what is the methodology , Basically I am not
> understanding the flow,
>
> (defn wrap-content-type [handler content-type]
> (fn [request]
> (let [response (handler request)]
> (assoc-in response [:headers "Content-Type"]
> content-type))))
>
> Can someone help me, please?
>
> Thanks,
> Ganesh N
>
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