Express : Path Parameter, query : url의 패스 파라미터, 쿼리 에 따른 req객체의 property

ref :

중요! 총정리 : https://syoung-journey.tistory.com/30

0. req.body :
   https://choice91.tistory.com/73

1. 파라미터, 쿼리 :
   https://react.vlpt.us/react-router/02-params-and-query.html

2. Express req객체 properties :
   https://www.javatpoint.com/expressjs-request

3. https://ssungkang.tistory.com/entry/Web-Path-Variable-VS-Query-Parameter