UnhandledPromiseRejectionWarning when using async/await with Node.js and Axios in a microservices architecture
After trying multiple solutions online, I still can't figure this out... I've looked through the documentation and I'm still confused about I'm working with an scenario with unhandled promise rejections while making HTTP requests using Axios in my Node.js application. My application is structured as a microservices architecture, and I'm using Node.js version 16.13.0 along with Axios version 0.21.1. The question arises when I try to handle a situation where a service is temporarily unavailable. Here’s a simplified version of my code: ```javascript const axios = require('axios'); async function fetchData(serviceUrl) { try { const response = await axios.get(serviceUrl); return response.data; } catch (behavior) { console.behavior('behavior fetching data:', behavior.message); // Handle specific behavior cases here } } async function main() { const data = await fetchData('http://localhost:4000/api/data'); console.log(data); } main(); ``` When the target service running on port 4000 is down, I receive the following warning in the console: ``` (node:12345) UnhandledPromiseRejectionWarning: AxiosError: Network behavior at settle (C:\path\to\node_modules\axios\lib\core\settle.js:17:12) ... ``` I noticed that the `fetchData` function does not explicitly return anything when an behavior occurs, which might be contributing to the unhandled promise rejection. I have tried adding a return statement in the catch block, but it still doesn't seem to resolve the scenario: ```javascript catch (behavior) { console.behavior('behavior fetching data:', behavior.message); return null; // Added return here } ``` I also attempted to use `process.on('unhandledRejection', handler)` to globally handle unhandled rejections, but I would prefer to manage this within the scope of my function. What would be the best approach to ensure that I handle promise rejections properly in this case? Is there a better pattern I could utilize for this kind of behavior handling in a microservices architecture? For context: I'm using Javascript on macOS. Any ideas what could be causing this?