springboot 403

跨域资源共享 CORS 详解 - 阮一峰

# 1.项目未添加Security依赖

前端地址: http://localhost:9528
后端地址: http://localhost:8889

• 前端调用接口 localhost:8888/user/login

• 对于非简单请求，浏览器首先会发起一个OPTIONS预检请求，询问服务器，当前网页所在的域名是否在服务器的许可名单之中，以及可以使用哪些HTTP动词和头信息字段。只有得到肯定答复，浏览器才会发出正式的XMLHttpRequest请求，否则就报错。

  
  OPTIONS请求

• 控制台:

  
  console
  

  出现了跨域情况

# 解决方案 1

在filter中添加白名单，完整filter代码⤵️

package com.futao.springmvcdemo.foundation;

import org.apache.commons.lang3.StringUtils;
import org.springframework.http.MediaType;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;

/**
 * @author futao
 * Created on 2018/9/19-15:47.
 */
@WebFilter(filterName = "AppFilter", urlPatterns = "/*")
public class AppFilter implements Filter {

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;

        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);

        ArrayList<String> allowOrigins = (ArrayList<String>) req.getServletContext().getAttribute("allowOrigins");
        String origin = request.getHeader("Origin");
        if (allowOrigins.contains(origin)) {
            response.setHeader("Access-Control-Allow-Origin", origin);
        }
        // Access-Control-Max-Age
        response.setHeader("Access-Control-Max-Age", "3600");
        // Access-Control-Allow-Credentials
        response.setHeader("Access-Control-Allow-Credentials", "true");
        // Access-Control-Allow-Methods
        response.setHeader("Access-Control-Allow-Methods", "PUT,POST, GET, OPTIONS, DELETE");

        response.setHeader("Access-Control-Allow-Headers", "Content-Type");

        chain.doFilter(req, resp);
    }

    @Override
    public void init(FilterConfig config) throws ServletException {
        //白名单
        ArrayList<String> allowOrigins = new ArrayList<>();
        allowOrigins.add("http://localhost:63343");
        allowOrigins.add("http://localhost:9528");
        config.getServletContext().setAttribute("allowOrigins", allowOrigins);
    }
}

• 再次发起请求

  
  image.png
  

  OK了

• 随后浏览器会自动发起原请求

  
  原请求

# 解决方案 2

• 新建CorsConfiguration配置类，自己百度

# 2.项目添加了Security依赖

需要额外添加如下配置

package com.futao.springmvcdemo.foundation;


import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

/**
 * @author futao
 * Created on 2018/11/6.
 */
@Configuration
@EnableWebSecurity
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .csrf().disable()
                .authorizeRequests()
                .antMatchers(HttpMethod.OPTIONS, "/**").permitAll()
                .antMatchers("/resources/**").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .and()
                .httpBasic();

    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web
                .ignoring()
                .antMatchers(HttpMethod.OPTIONS, "/**");
    }
}

如果同时进行了filter和CorsConfiguration的配置，OPTIONS请求会返回403，并且控制台提示It does not have HTTP ok status.，非常恶心。
疑问：OPTIONS请求到达服务器后是谁做出的响应