문제 발생 원인: 아마도 _csrf
<input type="hidden" name="${_csrf.parameterName }" value="${_csrf.token }"/>

해결
[web.xml]
<filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>  
       <param-name>forceEncoding</param-name>  
       <param-value>true</param-value>  
    </init-param> 
</filter>

<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

GET방식은 _csrf값 넘기지 않아도 된다.
POST방식일 땐 넘겨야 한다.

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