async cant use req ctx

server.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"crypto/tls"
 	"errors"
 	"io"
@@ -71,7 +72,7 @@ func (s *Server) Connect(w http.ResponseWriter, r *http.Request) {
 		defer src.Close()
 		io.Copy(
 			throttledWriter{
-				ctx:     r.Context(),
+				ctx:     context.Background(),
 				w:       dst,
 				limiter: s.limiter,
 			},