라우터

import { Route, Routes } from "react-router-dom";
import Header from "./components/Header";
function App() {
  return (
    <div>
      <Header />
      <Routes>
        <Route path="/" element={<Home />} />
        <Route path="/saveForm" element={<SaveForm />} />
        <Route path="/post/:id" element={<Detail />} />
        <Route path="/loginForm" element={<LoginForm />} />
        <Route path="/joinForm" element={<JoinForm />} />
        <Route path="/updateForm/:id" element={<UpdateForm />} />
      </Routes>
    </div>
  );
}
export default App;

package com.cos.jwt.config.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

public class CorsFilter implements Filter{

	public static final String TAG = "MyFilter1 : ";
	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		System.out.println("CORS 필터 작동");
		HttpServletResponse resp = (HttpServletResponse) response;
		resp.setHeader("Access-Control-Allow-Origin", "*");
		resp.setHeader("Access-Control-Allow-Methods", "*");
		resp.setHeader("Access-Control-Allow-Headers", "*");
		// 해당 헤더가 없으면 아래 7가지의 header값만 응답할 수 있다. 
		// Cache-Control
		//Content-Language
		//Content-Length
		//Content-Type
		//Expires
		//Last-Modified
		//Pragma
		resp.setHeader("Access-Control-Expose-Headers", "*");
		
		chain.doFilter(request, response);
	}

}

@RequiredArgsConstructor
@Configuration
public class FilterConfig {
	
	@Bean
	public FilterRegistrationBean<CorsFilter> corsFilter(){
		System.out.println("CORS 필터 등록");
		FilterRegistrationBean<CorsFilter> bean = new FilterRegistrationBean<>(new CorsFilter());
		bean.addUrlPatterns("/*");
		bean.setOrder(0); // 낮은 번호부터 실행됨.
		return bean;
	}
}

axios

When to Use Keys - Flutter Widgets 101 Ep. 4

In this episode, you will learn about key parameters on widgets: when you need keys, where to put keys in your widget tree, and which key is right for you. More specifically, you'll learn about he nuances of how keys work, discern when to use keys in your widget hierarchy, and identify the appropriate types of keys to optimize your widget-based structures. Chapters: 0:00 - Intro 0:39 - When to use keys 2:20 - How keys work 5:13 - Where to put keys 6:53 - Types of Keys Watch other episodes in the series → http://bit.ly/FlutterWidgets101 Subscribe to Google for Developers → https://goo.gle/developers

https://www.youtube.com/watch?v=kn0EOS-ZiIc