From Chrome 59 you can block specific requests from Network tab of developer tools itself.
https://developers.google.com/web/updates/2017/04/devtools-release-notes#block-requests
Right-click on the request in the Network panel and select Block Request URL. A new Request blocking tab pops up in the Drawer, which lets you manage blocked requests.
So, In my case, I will run the code block that specific API and then re-run. 🙂
As per the comment, this is not exactly canceling the already started request, but checking how the app behaves if only one request is failed by blocking only one request. Thanks @Ross Ivantsiv for this.
