strict-origin-when-cross-origin nginx、tomcat、java、vue 跨域问题

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配置跨域时，要考虑当前环境，只是代码层次，还是tomcat部署后的，再或者是nginx转发后的

1. java

   import java.util.List;

   import org.springframework.context.annotation.Configuration;
   import org.springframework.format.FormatterRegistry;
   import org.springframework.http.converter.HttpMessageConverter;
   import org.springframework.validation.MessageCodesResolver;
   import org.springframework.validation.Validator;
   import org.springframework.web.method.support.HandlerMethodArgumentResolver;
   import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
   import org.springframework.web.servlet.HandlerExceptionResolver;
   import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
   import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
   import org.springframework.web.servlet.config.annotation.CorsRegistry;
   import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
   import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
   import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
   import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
   import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
   import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
   import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

   @Configuration
   public class CommonInterceptor2 implements WebMvcConfigurer {

   @Override
   public void configurePathMatch(PathMatchConfigurer configurer) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void addFormatters(FormatterRegistry registry) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void addInterceptors(InterceptorRegistry registry) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void addResourceHandlers(ResourceHandlerRegistry registry) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void addCorsMappings(CorsRegistry registry) {
   	// TODO Auto-generated method stub
       registry.addMapping("/**")
       .allowedHeaders("*")
       .allowedMethods("POST","GET","PUT", "DELETE")
       .allowedOrigins("*");
   
   }
   
   @Override
   public void addViewControllers(ViewControllerRegistry registry) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void configureViewResolvers(ViewResolverRegistry registry) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
   	// TODO Auto-generated method stub
   
   }
   
   @Override
   public Validator getValidator() {
   	// TODO Auto-generated method stub
   	return null;
   }
   
   @Override
   public MessageCodesResolver getMessageCodesResolver() {
   	// TODO Auto-generated method stub
   	return null;
   }
   

2. tomcat

   https://blog.csdn.net/weixin_44100514/article/details/109781103?spm=1001.2014.3001.5501

3. vue

   proxy: { //配置跨域
   ‘/api’: {
   target: ‘http://IP:端口/’, //这里后台的地址模拟的
   changOrigin: true, //允许跨域
   pathRewrite: {
   /* 重写路径，当我们在浏览器中看到请求的地址为：http://localhost:8080/api/core/getData/userInfo 时
   实际上访问的地址是：http://121.121.67.254:8185/core/getData/userInfo,因为重写了 /api
   */
   ‘^/api’: ‘’
   }
   },
   }

4. nginx

   location/ {
   proxy_passhttp://localhost:8081/;

             #proxy_set_headerHost $host:80;
   
             #proxy_set_headerX-Real-IP $remote_addr;
   
             #proxy_set_headerX-Forwarded-For $proxy_add_x_forwarded_for;
   
   
   
             add_headerAccess-Control-Allow-Origin $http_origin;
   
             add_headerAccess-Control-Allow-Methods *;
   
             add_headerAccess-Control-Allow-Headers $http_access_control_request_headers;
   
             add_headerAccess-Control-Max-Age 60000;
   
             add_headerAccess-Control-Allow-Credentials true;
   
             if($request_method = OPTIONS){
                    return200;
   
             }
   
   }
   

跨域问题，主要需要知道，当前的环境。

1. 只有java层面上，java里加上跨域就可以
2. 部署环境，tomcat上部署，那么需要tomcat配置跨域
3. nginx + tomcat 那么不要同时配置跨域，会反复出现跨域了两次，你可以只在java层配置，tomcat不需要了，如果都配置，那么你还是跨域
4. vue前端一般不需要解决跨域问题 ，开发环境层次上可以加一下

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