refactor: routing info middleware (#37653)

fix #37650

modules/web/routing/requestrecord.go

@@ -12,20 +12,20 @@ import (
 )
 
 type requestRecord struct {
-	// index of the record in the records map
-	index uint64
-
 	// immutable fields
-	startTime      time.Time
-	request        *http.Request
-	responseWriter http.ResponseWriter
+	index      uint64 // unique number (per process) for the request
+	startTime  time.Time
+	request    *http.Request
+	respWriter http.ResponseWriter
 
 	// mutex
 	lock sync.RWMutex
 
-	// mutable fields
+	// below are mutable fields
+	funcInfo *FuncInfo
+	// * for "mark as long polling"
 	isLongPolling bool
-	logLevel      log.Level
-	funcInfo      *FuncInfo
-	panicError    error
+	// * for router logger
+	logLevel   log.Level
+	panicError error
 }