RestTemplateConfig 수정

src/main/java/com/kamco/cd/kamcoback/config/resttemplate/ExternalHttpClient.java

@@ -1,10 +1,14 @@
 package com.kamco.cd.kamcoback.config.resttemplate;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.log4j.Log4j2;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Component;
 import org.springframework.web.client.HttpStatusCodeException;
@@ -16,24 +20,16 @@ import org.springframework.web.client.RestTemplate;
 public class ExternalHttpClient {
 
   private final RestTemplate restTemplate;
-  private final com.fasterxml.jackson.databind.ObjectMapper objectMapper;
+  private final ObjectMapper objectMapper;
 
+  /** responseType(예: DTO.class, String.class 등)로 그대로 역직렬화해서 받는 호출. - 응답 타입이 명확히 고정일 때 사용 */
   public <T> ExternalCallResult<T> call(
       String url, HttpMethod method, Object body, HttpHeaders headers, Class<T> responseType) {
 
-    if (headers == null) headers = new HttpHeaders();
-    headers.setContentType(org.springframework.http.MediaType.APPLICATION_JSON);
-    headers.setAccept(java.util.List.of(org.springframework.http.MediaType.APPLICATION_JSON));
+    HttpHeaders resolvedHeaders = resolveJsonHeaders(headers);
+    logRequestBody(body);
 
-    try {
-      if (body != null) {
-        log.info("[HTTP-REQ-BODY-JSON] {}", objectMapper.writeValueAsString(body));
-      }
-    } catch (Exception e) {
-      log.warn("[HTTP-REQ-BODY-JSON] serialize failed: {}", e.getMessage());
-    }
-
-    HttpEntity<Object> entity = new HttpEntity<>(body, headers);
+    HttpEntity<Object> entity = new HttpEntity<>(body, resolvedHeaders);
 
     try {
       ResponseEntity<T> res = restTemplate.exchange(url, method, entity, responseType);
@@ -44,5 +40,51 @@ public class ExternalHttpClient {
     }
   }
 
+  /**
+   * 응답이 배열/객체/문자열/숫자 등 무엇이든 상관없이 "원문(JSON 문자열)"로 안전하게 받는 호출. - 응답 구조가 유동적이거나, String.class로 받았다가
+   * Jackson 컨버터 때문에 깨지는 케이스에 사용
+   */
+  public ExternalCallResult<String> callRaw(
+      String url, HttpMethod method, Object body, HttpHeaders headers) {
+
+    HttpHeaders resolvedHeaders = resolveJsonHeaders(headers);
+    logRequestBody(body);
+
+    HttpEntity<Object> entity = new HttpEntity<>(body, resolvedHeaders);
+
+    try {
+      ResponseEntity<byte[]> res = restTemplate.exchange(url, method, entity, byte[].class);
+      String raw =
+          (res.getBody() == null) ? null : new String(res.getBody(), StandardCharsets.UTF_8);
+      return new ExternalCallResult<>(res.getStatusCodeValue(), true, raw, null);
+    } catch (HttpStatusCodeException e) {
+      return new ExternalCallResult<>(
+          e.getStatusCode().value(), false, null, e.getResponseBodyAsString());
+    }
+  }
+
+  private HttpHeaders resolveJsonHeaders(HttpHeaders headers) {
+    HttpHeaders h = (headers == null) ? new HttpHeaders() : headers;
+
+    // 이미 세팅돼 있으면 존중하고, 없으면 JSON 기본값 세팅
+    if (h.getContentType() == null) {
+      h.setContentType(MediaType.APPLICATION_JSON);
+    }
+    if (h.getAccept() == null || h.getAccept().isEmpty()) {
+      h.setAccept(List.of(MediaType.APPLICATION_JSON));
+    }
+    return h;
+  }
+
+  private void logRequestBody(Object body) {
+    try {
+      if (body != null) {
+        log.info("[HTTP-REQ-BODY-JSON] {}", objectMapper.writeValueAsString(body));
+      }
+    } catch (Exception e) {
+      log.warn("[HTTP-REQ-BODY-JSON] serialize failed: {}", e.getMessage());
+    }
+  }
+
   public record ExternalCallResult<T>(int statusCode, boolean success, T body, String errBody) {}
 }