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问题
Springboot升级至2.4.0中出现的跨域问题。
在Springboot 2.4.0版本之前使用的是2.3.5.RELEASE，对应的Spring版本为5.2.10.RELEASE。
升级至2.4.0后，对应的Spring版本为5.3.1。
Springboot2.3.5.RELEASE时，我们可以使用CorsFilter设置跨域。
分析
版本2.3.5.RELEASE 设置跨域
设置代码如下：
@Configuration
public class ResourcesConfig implements WebMvcConfigurer {
@Bean
public CorsFilter corsFilter() {
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
CorsConfiguration config = new CorsConfiguration();
config.setAllowCredentials(true);
// 允许访问的客户端域名
config.addAllowedOrigin("*");
// 允许服务端访问的客户端请求头
config.addAllowedHeader("*");
// 允许访问的方法名,GET POST等
config.addAllowedMethod("*");
// 对接口配置跨域设置
source.registerCorsConfiguration("/**" , config);
return new CorsFilter(source);
}
}
是允许使用*设置允许的Origin。
这里我们看一下类CorsFilter的源码，5.3.x版本开始，针对CorsConfiguration新增了校验
5.3.x源码分析 CorsFilter
/**
* {@link javax.servlet.Filter} to handle CORS pre-flight requests and intercept
* CORS simple and actual requests with a {@link CorsProcessor}, and to update
* the response, e.g. with CORS response headers, based on the policy matched
* through the provided {@link CorsConfigurationSource}.
*
* <p>This is an alternative to configuring CORS in the Spring MVC Java config
* and the Spring MVC XML namespace. It is useful for applications depending
* only on spring-web (not on spring-webmvc) or for security constraints that
* require CORS checks to be performed at {@link javax.servlet.Filter} level.
*
* <p>This filter could be used in conjunction with {@link DelegatingFilterProxy}
* in order to help with its initialization.
*
* @author Sebastien Deleuze
* @since 4.2
* @see <a href="https://www.w3.org/TR/cors/" rel="external nofollow" >CORS W3C recommendation</a>
* @see UrlBasedCorsConfigurationSource
*/
public class CorsFilter extends OncePerRequestFilter {
private final CorsConfigurationSource configSource;
private CorsProcessor processor = new DefaultCorsProcessor();
/**
* Constructor accepting a {@link CorsConfigurationSource} used by the filter
* to find the {@link CorsConfiguration} to use for each incoming request.
* @see UrlBasedCorsConfigurationSource
*/
public CorsFilter(CorsConfigurationSource configSource) {
Assert.notNull(configSource, "CorsConfigurationSource must not be null");
this.configSource = configSource;
}
/**
* Configure a custom {@link CorsProcessor} to use to apply the matched
* {@link CorsConfiguration} for a request.
* <p>By default {@link DefaultCorsProcessor} is used.
*/
public void setCorsProcessor(CorsProcessor processor) {
Assert.notNull(processor, "CorsProcessor must not be null");
this.processor = processor;
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
FilterChain filterChain) throws ServletException, IOException {
CorsConfiguration corsConfiguration = this.configSource.getCorsConfiguration(request);
boolean isValid = this.processor.processRequest(corsConfiguration, request, response);
if (!isValid || CorsUtils.isPreFlightRequest(request)) {
return;
}
filterChain.doFilter(request, response);
}
}
类CorsFilter继承自OncePerRequestFilter，doFilterInternal方法会被执行。类中还创建了一个默认的处理类DefaultCorsProcessor，doFilterInternal调用this.processor.processRequest
往下
processRequest
@Override
@SuppressWarnings("resource")
public boolean processRequest(@Nullable CorsConfiguration config, HttpServletRequest request,
HttpServletResponse response) throws IOException {
Collection<String> varyHeaders = response.getHeaders(HttpHeaders.VARY);
if (!varyHeaders.contains(HttpHeaders.ORIGIN)) {
response.addHeader(HttpHeaders.VARY, HttpHeaders.ORIGIN);
}
if (!varyHeaders.contains(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD)) {
response.addHeader(HttpHeaders.VARY, HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD);
}
if (!varyHeaders.contains(HttpHeaders.ACCESS_CONTROL_REQUEST_HEADERS)) {
response.addHeader(HttpHeaders.VARY, HttpHeaders.ACCESS_CONTROL_REQUEST_HEADERS);
}
if (!CorsUtils.isCorsRequest(request)) {
return true;
}
if (response.getHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN) != null) {
logger.trace("Skip: response already contains \"Access-Control-Allow-Origin\"");
return true;
}
boolean preFlightRequest = CorsUtils.isPreFlightRequest(request);
if (config == null) {
if (preFlightRequest) {
rejectRequest(new ServletServerHttpResponse(response));
return false;
}
else {
return true;
}
}
return handleInternal(new ServletServerHttpRequest(request), new ServletServerHttpResponse(response), config, preFlightRequest);
}
进入最后一行
handleInternal
/**
* Handle the given request.
*/
protected boolean handleInternal(ServerHttpRequest request, ServerHttpResponse response,
CorsConfiguration config, boolean preFlightRequest) throws IOException {
String requestOrigin = request.getHeaders().getOrigin();
String allowOrigin = checkOrigin(config, requestOrigin);
(省略...)
response.flush();
return true;
}
查看方法checkOrigin
checkOrigin
@Nullable
protected String checkOrigin(CorsConfiguration config, @Nullable String requestOrigin) {
return config.checkOrigin(requestOrigin);
}
Go on
checkOrigin
/**
* Check the origin of the request against the configured allowed origins.
* @param requestOrigin the origin to check
* @return the origin to use for the response, or {@code null} which
* means the request origin is not allowed
*/
@Nullable
public String checkOrigin(@Nullable String requestOrigin) {
if (!StringUtils.hasText(requestOrigin)) {
return null;
}
if (!ObjectUtils.isEmpty(this.allowedOrigins)) {
if (this.allowedOrigins.contains(ALL)) {
validateAllowCredentials();
return ALL;
}
for (String allowedOrigin : this.allowedOrigins) {
if (requestOrigin.equalsIgnoreCase(allowedOrigin)) {
return requestOrigin;
}
}
}
if (!ObjectUtils.isEmpty(this.allowedOriginPatterns)) {
for (OriginPattern p : this.allowedOriginPatterns) {
if (p.getDeclaredPattern().equals(ALL) || p.getPattern().matcher(requestOrigin).matches()) {
return requestOrigin;
}
}
}
return null;
}
方法validateAllowCredentials
validateAllowCredentials
/**
* Validate that when {@link #setAllowCredentials allowCredentials} is true,
* {@link #setAllowedOrigins allowedOrigins} does not contain the special
* value {@code "*"} since in that case the "Access-Control-Allow-Origin"
* cannot be set to {@code "*"}.
* @throws IllegalArgumentException if the validation fails
* @since 5.3
*/
public void validateAllowCredentials() {
if (this.allowCredentials == Boolean.TRUE &&
this.allowedOrigins != null && this.allowedOrigins.contains(ALL)) {
throw new IllegalArgumentException(
"When allowCredentials is true, allowedOrigins cannot contain the special value \"*\"" +
"since that cannot be set on the \"Access-Control-Allow-Origin\" response header. " +
"To allow credentials to a set of origins, list them explicitly " +
"or consider using \"allowedOriginPatterns\" instead.");
}
看一下ALL是什么
/** Wildcard representing <em>all</em> origins, methods, or headers. */
public static final String ALL = "*";
所以如果使用2.4.0版本，还是设置*的话，访问API接口就会报错：
异常
java.lang.IllegalArgumentException: When allowCredentials is true, allowedOrigins cannot contain the special value "*"since that cannot be set on the "Access-Control-Allow-Origin" response header. To allow credentials to a set of origins, list them explicitly or consider using "allowedOriginPatterns" instead.
at org.springframework.web.cors.CorsConfiguration.validateAllowCredentials(CorsConfiguration.java:457)
at org.springframework.web.cors.CorsConfiguration.checkOrigin(CorsConfiguration.java:561)
at org.springframework.web.cors.DefaultCorsProcessor.checkOrigin(DefaultCorsProcessor.java:174)
at org.springframework.web.cors.DefaultCorsProcessor.handleInternal(DefaultCorsProcessor.java:116)
at org.springframework.web.cors.DefaultCorsProcessor.processRequest(DefaultCorsProcessor.java:95)
at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:87)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
修改方式
方式1
不使用CorsFilter，直接重写方法addCorsMappings：
@Configuration
public class ResourcesConfig implements WebMvcConfigurer {
/**
* 跨域配置
*/
@Override
public void addCorsMappings(CorsRegistry registry) {
//对那些请求路径进行跨域处理
registry.addMapping("/**")
// 允许的请求头，默认允许所有的请求头
.allowedHeaders("*")
// 允许的方法，默认允许GET、POST、HEAD
.allowedMethods("*")
// 探测请求有效时间，单位秒
.maxAge(1800)
// 支持的域
.allowedOrigins("*");
}
}
方式2
继续使用CorsFilter，使用官方推荐的allowedOriginPatterns：
application.yml中新增配置：
（注：这里只是举个栗子…Origin的处理）
# 项目相关配置
project:
uiPort: 8082
basePath: http://localhost:${project.uiPort}
@Configuration
public class ResourcesConfig implements WebMvcConfigurer {
@Value("${project.basePath}")
private String basePath;
@Bean
public CorsFilter corsFilter() {
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
CorsConfiguration config = new CorsConfiguration();
config.setAllowCredentials(true);
// 允许访问的客户端域名
List<String> allowedOriginPatterns = new ArrayList<>();
allowedOriginPatterns.add(basePath);
config.setAllowedOriginPatterns(allowedOriginPatterns);
// config.addAllowedOrigin(serverPort);
// 允许服务端访问的客户端请求头
config.addAllowedHeader("*");
// 允许访问的方法名,GET POST等
config.addAllowedMethod("*");
// 对接口配置跨域设置
source.registerCorsConfiguration("/**" , config);
return new CorsFilter(source);
}
}
到此这篇关于Springboot升级至2.4.0中出现的跨域问题分析及修改方案的文章就介绍到这了,更多相关Springboot2.4.0跨域内容请搜索社区以前的文章或继续浏览下面的相关文章希望大家以后多多支持社区！ | 
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