Hey @zhangmingcheng28 Yes! You need to have a webserver that is listening on localhost over the port number you are trying to access.
Once you send the request via Postman to that server, it will (or should) process your request and then return a response.
Here is a tutorial using NodeJS to create a simple web-server running locally: https://nodejs.org/en/knowledge/HTTP/servers/how-to-create-a-HTTP-server/
If you prefer any other language, search online to find out how to create a web-server using that programming language.