The app on port 11501 is expecting standard HTTP traffic, but you used https:// .
Plus, many modern frameworks (Create React App, Next.js, Vite) added built-in options for local HTTPS via self-signed certificates or tools like mkcert . https localhost11501 2021
To understand why a service uses this specific address, it helps to break the URL down into its three core components: The app on port 11501 is expecting standard
Thus, a URL like https://localhost:11501/2021 is a time capsule of a developer testing a secure, local web app from that era. but you used https:// . Plus
Localhost 8080 refers to accessing a web service running on your own computer through port 8080, a commonly used HTTP development ... Free Services to Expose Localhost to HTTPS A Comparison