Web Reference: Read the error message properly it's saying invalid URL. Here you are using localhost:app in your URL 'http://localhost:app/api/reviews' which is incorrect. You have to use some kind of open port number instead of random text. For example 3000, 4000, 5000, 8080, 8000, etc. So your URL will be like this 'http://localhost:3000/api/reviews' May 19, 2023 · Had the same problem and solved it by closing any program that used or block the serialport. In my case Arduino IDE was open and whhen closing it and refreshing the browser it all worked. I hope it helps someone... Jan 16, 2026 · In this blog, we’ll demystify this error, explore its root causes, and provide a step-by-step guide to fix it. By the end, you’ll be equipped to diagnose and resolve URL-related issues in Angular HTTP requests with confidence.
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