why this api is not working?

https://api.codechef.com/contests/{COOK97B}/problems/{BFTT}?fields=BFTT

When I am pasting this link in chrome a blank page is coming why so?

"https://api.codechef.com/contests/{COOK97B}/problems/{BFTT}?fields=BFTT

Hi,
You cannot run these APIs in chrome like this.
First you need to get access token then send request using that access token.
Please read this documentation clearly https://developers.codechef.com/#steps-to-implement-oauth2-in-your-application