fixed json access logger

internal/net/http/accesslog/fields.go

@@ -41,7 +41,7 @@ func processMap[V any](cfg *FieldConfig, m map[string]V, redactedV V) map[string
 		return m
 	}
 
-	newMap := make(map[string]V)
+	newMap := make(map[string]V, len(m))
 	for k := range m {
 		var mode FieldMode
 		var ok bool

internal/net/http/accesslog/formatter.go

@@ -123,6 +123,11 @@ func (f JSONFormatter) Format(line *bytes.Buffer, req *http.Request, res *http.R
 		entry.Error = res.Status
 	}
 
+	if entry.ContentType != "" {
+		// try to get content type from request
+		entry.ContentType = req.Header.Get("Content-Type")
+	}
+
 	marshaller := json.NewEncoder(line)
 	err := marshaller.Encode(entry)
 	if err != nil {