Fix error reponses

Signed-off-by: Asai Neko <sugar@sne.moe>

middleware/gin_logger.go

@@ -2,6 +2,7 @@ package middleware
 
 import (
 	"bytes"
+	"encoding/json"
 	"io"
 	"log/slog"
 	"time"
@@ -17,6 +18,8 @@ func GinLogger() gin.HandlerFunc {
 			c.Request.Body = io.NopCloser(bytes.NewBuffer(body))
 		}
 
+		headerJSON, _ := json.Marshal(c.Request.Header)
+
 		startTime := time.Now()
 
 		c.Next()
@@ -33,6 +36,7 @@ func GinLogger() gin.HandlerFunc {
 			"ip", c.ClientIP(),
 			"latency", time.Since(startTime).String(),
 			"user_agent", c.Request.UserAgent(),
+			"headers", string(headerJSON),
 			"request_body", string(body),
 			"errors", errorMessage,
 		}