我使用的是spring框架，当我尝试向postman注册用户时，控制台中总是出现此错误，因此我无法注册用户

POST http://localhost:8080/api/auth/signup
Error: connect ECONNREFUSED 127.0.0.1:8080
Request Headers
Content-Type: application/json
User-Agent: PostmanRuntime/7.25.0
Accept: */*
Postman-Token: c8f92e31-e8f6-40d9-90b0-2bd4faba0552
Host: localhost:8080
Accept-Encoding: gzip, deflate, br
Connection: keep-alive

Request Body
{
    "username":"TestUserX",
    "email":"TestUserX@bla.com",
    "password":"password1"
}