fix: StringHttpMessageConverter UTF-8 설정

mens-core/src/main/java/kr/xit/core/spring/config/WebMvcConfig.java

@@ -1,5 +1,6 @@
 package kr.xit.core.spring.config;
 
+import java.nio.charset.*;
 import java.util.*;
 
 import javax.servlet.DispatcherType;
@@ -247,6 +248,12 @@ public class WebMvcConfig implements WebMvcConfigurer {
 //        resolvers.add(new PageableArgumentResolver());
     }
 
+
+    @Bean
+    public HttpMessageConverter<String> responseBodyConverter() {
+        return new StringHttpMessageConverter(StandardCharsets.UTF_8);
+    }
+    
     /**
      * MappingJackson2XmlHttpMessageConverter 를 가장 후순위로 조정하는 메소드
      * @param converters
@@ -262,6 +269,7 @@ public class WebMvcConfig implements WebMvcConfigurer {
                 iterator.remove();
             }
         }
+        converters.add(responseBodyConverter());
         converters.addAll(xml);
     }