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Proposal: fetch with multiple AbortSignals - I got the idea of merging multiple signals from here.
In my latest project, I made a Node/Express API backend which acted as a proxy between multiple public APIs and my frontend. after deploying it to Vercel, I encountered this error: The Serverless Function has timed out. This happens when one of the upstream APIs takes too long to respond but could also happen with slow database connections. Vercel has a guide on this error that explains why it happens and that your backend should return a response to the client if the upstream service takes too long and not wait forever for the response.
Cover photo by Israel Palacio on Unsplash
After writing the above functions and using them in my Node/Express API, in case of a fetch timeout, I could return an error like: selected API took too long to respond. and I didn't get the The Serverless Function has timed out. error anymore. Now I wanted to use the same function in my frontend React app as well and show an error in case of timeout (and refetch after a while), instead of waiting for the fetch() forever. but I encountered a problem.