postman: You need to enable JavaScript to run this app
I don't think that POSTMAN is capable of executing JavaScript in its console.Try doing the same in the web browser it will work (You won't see this error message).
I spent some times pondering on this trepidation.. and then suddenly i realized what was going on..
- the endpoint does not exist, it could be a misspelling
- not in the same directory as you expect it to be,try adding or removing "/" at the beginning of the url, particularly if you don't specify the hostname, i.e.
fetch('getusername')is different fromfetch('/getusername').. This acceptable in development but NOT when already deployed, it points to different path. - the endpoint may be working fine in the Development,but somewhere within in the Production/Staging, it generated some exception.