capture http servers error logs

otherwise they will be printed to stdout

webdavd/server.go

@@ -5,6 +5,7 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
+	"log"
 	"net/http"
 	"path"
 	"path/filepath"
@@ -42,6 +43,7 @@ func (s *webDavServer) listenAndServe() error {
 		ReadHeaderTimeout: 30 * time.Second,
 		IdleTimeout:       120 * time.Second,
 		MaxHeaderBytes:    1 << 16, // 64KB
+		ErrorLog:          log.New(&logger.StdLoggerWrapper{Sender: logSender}, "", 0),
 	}
 	if s.config.Cors.Enabled {
 		c := cors.New(cors.Options{