问题发现

正常情况下，跨域是这样的： 
1. 微服务配置跨域+zuul不配置=有跨域问题 
2. 微服务配置+zuul配置=有跨域问题 
3. 微服务不配置+zuul不配置=有跨域问题 
4. 微服务不配置+zuul配置=ok

然而云环境中每个服务自己有跨域解决方案，而网关需要做最外层的跨域解决方案.如果服务已有跨域配置网关也有，会出现*多次配置问题。

Access-Control-Allow-Origin:"*,*"

也就是multiple Access-Control-Allow-Origin
！！！所以我们就要，微服务配置+zuul配置=解决跨域问题

zuul的跨域忽略配置

使用ZUUL配置忽略头部信息   解决 cookie跨域携带问题

zuul:
#需要忽略的头部信息，不在传播到其他服务
  sensitive-headers: Access-Control-Allow-Origin
  ignored-headers: Access-Control-Allow-Origin,H-APP-Id,Token,APPToken

微服务应用的跨域配置

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component  
public class CorsFilter implements Filter {  
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {  
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;  
       /* String curOrigin = request.getHeader("Origin");
        System.out.println("###跨域过滤器->当前访问来源->"+curOrigin+"###");   */
        response.setHeader("Access-Control-Allow-Origin", "*");  
        response.setHeader("Access-Control-Allow-Methods", "*");  
        response.setHeader("Access-Control-Max-Age", "3600");  
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with"); 
        chain.doFilter(req, res);  
    }  
    @Override
    public void init(FilterConfig filterConfig) {}  

    @Override
    public void destroy() {}  
}  
 

zuul路由的跨域配置

@EnableZuulProxy

 启动类里增加bean

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import java.util.ArrayList;
import java.util.List;

@Bean
public CorsFilter corsFilter() {
    final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    final CorsConfiguration config = new CorsConfiguration();
    config.setAllowCredentials(true); // 允许cookies跨域
    config.addAllowedOrigin("*");// 允许向该服务器提交请求的URI，*表示全部允许。。这里尽量限制来源域，比如http://xxxx:8080 ,以降低安全风险。。
    config.addAllowedHeader("*");// 允许访问的头信息,*表示全部
    config.setMaxAge(18000L);// 预检请求的缓存时间（秒），即在这个时间段里，对于相同的跨域请求不会再预检了
    config.addAllowedMethod("*");// 允许提交请求的方法，*表示全部允许，也可以单独设置GET、PUT等
    config.addAllowedMethod("HEAD");
    config.addAllowedMethod("GET");// 允许Get的请求方法
    config.addAllowedMethod("PUT");
    config.addAllowedMethod("POST");
    config.addAllowedMethod("DELETE");
    config.addAllowedMethod("PATCH");
    source.registerCorsConfiguration("/**", config);
    return new CorsFilter(source);
}

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https://blog.csdn.net/moshowgame/article/details/80507696

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