没有不可认识的东西，我们只能说还有尚未被认识的东西。——高尔基
今天发现一个问题，前端跨域，这个我已经解决无数次了，但上了个网关，还是踩坑了
首先是网关配置了跨域
代码语言：javascript复制@Bean
public CorsWebFilter corsFilter() {
CorsConfiguration config = new CorsConfiguration();
config.addAllowedOriginPattern("*");
config.addAllowedHeader("*");
config.addAllowedMethod("*");
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/**", config);
return new CorsWebFilter(source);
}然后报错提示重复的Access-Control-Allow-Origin请求头
注释掉又报错跨域
最后发现是网关路由到的子服务也配置了允许跨域。。。
代码语言：javascript复制/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import jakarta.annotation.Resource;
import org.dromara.streamquery.stream.core.stream.Steam;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.http.converter.ByteArrayHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.Collections;
import java.util.List;
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
private static final String[] CORS_MAPPINGS_ALLOWED_METHODS = {
HttpMethod.POST.name(),
HttpMethod.GET.name(),
HttpMethod.PUT.name(),
HttpMethod.OPTIONS.name(),
HttpMethod.DELETE.name()
};
@Resource
private Jackson2HttpMessageConverter jackson2HttpMessageConverter;
@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
// 将MappingJackson2HttpMessageConverter放到第一个
converters.removeIf(converter -> converter instanceof MappingJackson2HttpMessageConverter);
converters.add(jackson2HttpMessageConverter);
Collections.reverse(converters);
Integer byteConverterIdx = Steam.of(converters).findFirstIdx(c -> c instanceof ByteArrayHttpMessageConverter);
converters.add(0, converters.get(byteConverterIdx));
}
@Override
public void addCorsMappings(CorsRegistry registry) {
registry
.addMapping("/**")
.allowedOriginPatterns("*")
.allowedMethods(CORS_MAPPINGS_ALLOWED_METHODS)
.allowedHeaders("*")
.allowCredentials(true)
.maxAge(3600);
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
WebMvcConfigurer.super.addInterceptors(registry);
}
}取消掉addCorsMappings的配置即可
