app.listen(path, [callback])
启动一个 UNIX 套接字并监听给定路径上的连接。此方法与 Node 的 http.Server.listen() 相同。
Starts a UNIX socket and listens for connections on the given path. This method is identical to Node's http.Server.listen().
const express = require('express')
const app = express()
app.listen('/tmp/sock')