<filter>
  <filter-name>CorsFilter</filter-name>
  <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>CorsFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

filter를 직접 만들 수도 있지만 원래 톰캣에 있는 걸 쓰는게 더 좋은 것 같다.

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