Springboot 1.0 升级到 Springboot 2.0 @CrossOrigin 跨域问题
在spring boot 1.5中，配置跨域一般是直接在controller或是在某一个方法上添加 @CrossOrigin 注解即可，如下：
但是升级到spring boot 2.0版本（springframework5.0.2）后，浏览器会报错
查看options请求的响应可以看到Access-Control-Allow-Origin字段为*
这里响应头中Access-Control-Allow-Origin必须为指定的域名，并且如果想要携带cookie信息还需要添加
Access-Control-Allow-Credentials: true
看一下@CrossOrigin源码
springframework4.3.12：
/**
* Whether the browser should include any cookies associated with the
* domain of the request being annotated.
* <p>Set to {@code "false"} if such cookies should not included.
* An empty string ({@code ""}) means <em>undefined</em>.
* {@code "true"} means that the pre-flight response will include the header
* {@code Access-Control-Allow-Credentials=true}.
* <p>If undefined, credentials are allowed.
*/
String allowCredentials() default "";
springframework5.0.2
/**
* Whether the browser should send credentials, such as cookies along with
* cross domain requests, to the annotated endpoint. The configured value is
* set on the {@code Access-Control-Allow-Credentials} response header of
* preflight requests.
* <p><strong>NOTE:</strong> Be aware that this option establishes a high
* level of trust with the configured domains and also increases the surface
* attack of the web application by exposing sensitive user-specific
* information such as cookies and CSRF tokens.
* <p>By default this is not set in which case the
* {@code Access-Control-Allow-Credentials} header is also not set and
* credentials are therefore not allowed.
*/
String allowCredentials() default "";
重点在这里
By default this is not set in which case the {@code Access-Control-Allow-Credentials} header is also not set and credentials are therefore not allowed.
原因是5.0.2后，allowCredentials默认为false了，再看 DefaultCorsProcessor
if (Boolean.TRUE.equals(config.getAllowCredentials())) {
responseHeaders.setAccessControlAllowCredentials(true);
}
allowCredentials为true时，返回的响应头AccessControlAllowCredentials属性才设置为true，允许客户端携带验证消息。
解决办法：
在注解中设置allowCredentials为true即可。
响应如下：
正文到此结束
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