: This could be a development server for a web application you're building. Many frameworks and backend technologies (like Node.js, Python's Flask or Django, Ruby on Rails, etc.) start a local development server that you can access through localhost and a specific port.
: localhost is a hostname that refers to the local machine. When you access http://localhost:11501 , you're essentially making a request to your own machine. This is commonly used for testing web applications or services without making them publicly available. http //localhost 11501
The most common cause is that the required software isn't active. : This could be a development server for