Https Localhost11501 2021 -

This specifies the protocol — Hypertext Transfer Protocol Secure. Unlike HTTP, HTTPS encrypts traffic between your browser and the server. On localhost (your own computer), HTTPS is often set up with self-signed certificates for testing web applications that require secure contexts (e.g., accessing geolocation, service workers, or HTTP/2).

1. "Your Connection is Not Private" (SSL Certificate Errors) https localhost11501 2021

The local development server is running, but it has not been configured to handle HTTPS requests. This specifies the protocol — Hypertext Transfer Protocol

If you want this address to work, follow these steps (using 2021-era tools for authenticity). A "port" is a virtual endpoint for network

A "port" is a virtual endpoint for network communication on your computer, allowing different applications to listen for incoming traffic without interfering with one another. Services often listen on "well-known" ports like 80 (HTTP) or 443 (HTTPS). Port 11501 is not in the list of well-known ports and is considered a "dynamic" or "private" port, typically used by custom applications.

Before 2020–2021, most developers used http://localhost . But browsers began requiring secure contexts for powerful features like:

Because localhost certificates are self-signed rather than issued by a trusted certificate authority (CA), browsers like Google Chrome or Microsoft Edge will block the connection by default.