跨域问题以及经过网关二次转发重复跨域

1跨域问题解决

package com.win.credit.point.gateway.config;

import java.time.Duration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsWebFilter;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;
import org.springframework.web.util.pattern.PathPatternParser;
/**
 */
@Configuration
public class CorsConfig {
    @Bean
    public CorsWebFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedMethod("*");;
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.setMaxAge(Duration.ofHours(24));//options重复请求cache优化
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
        source.registerCorsConfiguration("/**", config);

        return new CorsWebFilter(source);
    }
}

2有网关一层，网关会转发一次，重复跨域

package com.win.credit.point.gateway.filter;
import java.util.Arrays;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.cloud.gateway.filter.NettyWriteResponseFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Mono;
/**
 * 重复跨域，去重
 */
@Component("corsResponseHeaderFilter")
public class ResponseCorsHeaderFilter implements GlobalFilter, Ordered {

    private static final Logger logger = LoggerFactory.getLogger(ResponseCorsHeaderFilter.class);
    
    @Override
    public int getOrder() {
        // 指定此过滤器位于NettyWriteResponseFilter之后
        // 即待处理完响应体后接着处理响应头
        return NettyWriteResponseFilter.WRITE_RESPONSE_FILTER_ORDER + 1000;
    }

    /**
     * Process the Web request and (optionally) delegate to the next {@code WebFilter}
     * through the given {@link GatewayFilterChain}.
     *
     * @param exchange the current server exchange
     * @param chain    provides a way to delegate to the next filter
     * @return {@code Mono} to indicate when request processing is complete
     */
    @Override
    public Mono filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        return chain.filter(exchange).then(Mono.fromRunnable(() -> {
            exchange.getResponse().getHeaders().entrySet().stream()
            .filter(kv -> (kv.getValue() != null && kv.getValue().size() > 1))
            .filter(kv -> (kv.getKey().equals(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN)
                    || kv.getKey().equals(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS)))
            .forEach(kv -> {
                kv.setValue(Arrays.asList(kv.getValue().get(1)));
            });
        }));
    }
}
 

本文只给解决方式，仅供参考。