diff --git a/KissMe/Sources/Common/Request.swift b/KissMe/Sources/Common/Request.swift
index a98c7ca..699d0bd 100644
--- a/KissMe/Sources/Common/Request.swift
+++ b/KissMe/Sources/Common/Request.swift
@@ -88,7 +88,7 @@ extension Request {
         switch val {
         case "true", "1":  return true
         case "false", "0": return false
-        default:           return true
+        default:           return false
         }
     }
     public var traceable: Bool { false }
@@ -164,12 +164,19 @@ extension Request {
                 return
             }
             
-            let stringData = String(data: data, encoding: .utf8) ?? ""
+            var stringData = String(data: data, encoding: .utf8) ?? ""
+            
             //print(stringData.prefix(1024))
-            if responseDataLoggable {
-                let logName = "log/\(Date().yyyyMMdd_HHmmssSSSS_forFile)_\(url.lastPathComponent).json"
-                let logUrl = URL.currentDirectory().appending(path: logName)
-                try? stringData.write(toFile: logUrl.path, atomically: false, encoding: .utf8)
+            let responseDataLogging: (String?)->Void = { moreError in
+                if moreError != nil || responseDataLoggable {
+                    let logName = "log/\(Date().yyyyMMdd_HHmmssSSSS_forFile)_\(url.lastPathComponent).json"
+                    let logUrl = URL.currentDirectory().appending(path: logName)
+                    if let moreError = moreError {
+                        stringData += "\n\n"
+                        stringData += moreError
+                    }
+                    try? stringData.write(toFile: logUrl.path, atomically: false, encoding: .utf8)
+                }
             }
             
             do {
@@ -177,8 +184,10 @@ extension Request {
                 decoder.keyDecodingStrategy = .useDefaultKeys
                 
                 let result = try decoder.decode(KResult.self, from: data)
+                responseDataLogging(nil)
                 completion(.success(result))
             } catch {
+                responseDataLogging(error.localizedDescription)
                 completion(.failure(error))
             }
         }.resume()
diff --git a/README.md b/README.md
index 96617c5..adf2af8 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ WIP `showcase` | 추천 상품을 제안함.
 
 Environment variable | 설명
 -------------------- | ---
-KISS_RESPONSE_LOGGABLE | `true`, `1` 이면, API 응답로그를 기록함. `false`, `0` 이면 기록하지 않음.
+KISS_RESPONSE_LOGGABLE | `true`, `1` 이면, API 응답로그를 기록함. `false`, `0` 이면 기록하지 않음. 기본값은 `false`.
 
 
 # KissMeIndex