Worker with async Promises throws “This script will never generate a response.”
Hi, I have the following script hosted on a worker. When I send a HTTP POST request to /api/log with entries to log, I get an error from Cloudflare that the script will never generate a response.
I am using a KV namespace for the worker code. The idea is to be able to write logs that I can use to communicate between platforms.
2 Replies
check your switch/case block
you don't have
default branch. If (theoretically) none of your cases match, then there is no Response returnedThere shouldn’t be any switch case in the if-statement I’m hitting. I know that if I have a payload with 0 objects in the array then the code responds fine. If I hit the /api/userloads endpoint then that also works fine. So I’m narrowing it down to do with the Promises somehow not resolving. But I’m unsure if I can debug this with some breakpoints locally (though it likely might be possible) 
Solution
The code within the Promise was failing.
Solution
The code within the Promise was failing.
const userLogsStr = (await env.FF_EVENTLOG.get('log_' + _userId + '_' + pageIndex, 'text')) || '';
That line would firstly result in en empty string, which couldn't be parsed and cast to the type UserLogs which is an array-type.
Because of this the code erroneously(?) errored that a response couldn't ever be generated 🙂
Changing '' to '[]' fixes the problem.