Use one http response recorder per external http call (#16938)

internal/logger/audit.go

@@ -24,6 +24,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/minio/minio/internal/http/stats"
 	internalAudit "github.com/minio/minio/internal/logger/message/audit"
 	"github.com/minio/pkg/logger/message/audit"
 
@@ -96,20 +97,27 @@ func AuditLog(ctx context.Context, w http.ResponseWriter, r *http.Request, reqCl
 		)
 
 		var st *xhttp.ResponseRecorder
-		switch v := w.(type) {
-		case *xhttp.ResponseRecorder:
-			st = v
-		case *gzhttp.GzipResponseWriter:
-			// the writer may be obscured by gzip response writer
-			if rw, ok := v.ResponseWriter.(*xhttp.ResponseRecorder); ok {
-				st = rw
-			}
-		case *gzhttp.NoGzipResponseWriter:
-			// the writer may be obscured by no-gzip response writer
-			if rw, ok := v.ResponseWriter.(*xhttp.ResponseRecorder); ok {
-				st = rw
+
+		for {
+			switch v := w.(type) {
+			case *gzhttp.GzipResponseWriter:
+				// the writer may be obscured by gzip response writer
+				w = v.ResponseWriter
+			case *gzhttp.NoGzipResponseWriter:
+				// the writer may be obscured by no-gzip response writer
+				w = v.ResponseWriter
+			case *stats.OutgoingTrafficMeter:
+				// the writer may be obscured by http stats response writer
+				w = v.ResponseWriter
+			case *xhttp.ResponseRecorder:
+				st = v
+				goto exit
+			default:
+				goto exit
 			}
 		}
+	exit:
+
 		if st != nil {
 			statusCode = st.StatusCode
 			timeToResponse = time.Now().UTC().Sub(st.StartTime)