Fix QUIC defragger

common/baderror/baderror.go

@@ -1,62 +0,0 @@
-package baderror
-
-import (
-	"context"
-	"io"
-	"net"
-	"strings"
-
-	E "github.com/sagernet/sing/common/exceptions"
-)
-
-func Contains(err error, msgList ...string) bool {
-	for _, msg := range msgList {
-		if strings.Contains(err.Error(), msg) {
-			return true
-		}
-	}
-	return false
-}
-
-func WrapH2(err error) error {
-	if err == nil {
-		return nil
-	}
-	err = E.Unwrap(err)
-	if err == io.ErrUnexpectedEOF {
-		return io.EOF
-	}
-	if Contains(err, "client disconnected", "body closed by handler", "response body closed", "; CANCEL") {
-		return net.ErrClosed
-	}
-	return err
-}
-
-func WrapGRPC(err error) error {
-	// grpc uses stupid internal error types
-	if err == nil {
-		return nil
-	}
-	if Contains(err, "EOF") {
-		return io.EOF
-	}
-	if Contains(err, "Canceled") {
-		return context.Canceled
-	}
-	if Contains(err,
-		"the client connection is closing",
-		"server closed the stream without sending trailers") {
-		return net.ErrClosed
-	}
-	return err
-}
-
-func WrapQUIC(err error) error {
-	if err == nil {
-		return nil
-	}
-	if Contains(err, "canceled by local with error code 0") {
-		return net.ErrClosed
-	}
-	return err
-}