diff --git a/unrouted_handler.go b/unrouted_handler.go
index c547fd2..f35adae 100644
--- a/unrouted_handler.go
+++ b/unrouted_handler.go
@@ -47,19 +47,21 @@ func NewHTTPError(err error, statusCode int) HTTPError {
 }
 
 var (
-	ErrUnsupportedVersion  = NewHTTPError(errors.New("unsupported version"), http.StatusPreconditionFailed)
-	ErrMaxSizeExceeded     = NewHTTPError(errors.New("maximum size exceeded"), http.StatusRequestEntityTooLarge)
-	ErrInvalidContentType  = NewHTTPError(errors.New("missing or invalid Content-Type header"), http.StatusBadRequest)
-	ErrInvalidUploadLength = NewHTTPError(errors.New("missing or invalid Upload-Length header"), http.StatusBadRequest)
-	ErrInvalidOffset       = NewHTTPError(errors.New("missing or invalid Upload-Offset header"), http.StatusBadRequest)
-	ErrNotFound            = NewHTTPError(errors.New("upload not found"), http.StatusNotFound)
-	ErrFileLocked          = NewHTTPError(errors.New("file currently locked"), 423) // Locked (WebDAV) (RFC 4918)
-	ErrMismatchOffset      = NewHTTPError(errors.New("mismatched offset"), http.StatusConflict)
-	ErrSizeExceeded        = NewHTTPError(errors.New("resource's size exceeded"), http.StatusRequestEntityTooLarge)
-	ErrNotImplemented      = NewHTTPError(errors.New("feature not implemented"), http.StatusNotImplemented)
-	ErrUploadNotFinished   = NewHTTPError(errors.New("one of the partial uploads is not finished"), http.StatusBadRequest)
-	ErrInvalidConcat       = NewHTTPError(errors.New("invalid Upload-Concat header"), http.StatusBadRequest)
-	ErrModifyFinal         = NewHTTPError(errors.New("modifying a final upload is not allowed"), http.StatusForbidden)
+	ErrUnsupportedVersion               = NewHTTPError(errors.New("unsupported version"), http.StatusPreconditionFailed)
+	ErrMaxSizeExceeded                  = NewHTTPError(errors.New("maximum size exceeded"), http.StatusRequestEntityTooLarge)
+	ErrInvalidContentType               = NewHTTPError(errors.New("missing or invalid Content-Type header"), http.StatusBadRequest)
+	ErrInvalidUploadLength              = NewHTTPError(errors.New("missing or invalid Upload-Length header"), http.StatusBadRequest)
+	ErrInvalidOffset                    = NewHTTPError(errors.New("missing or invalid Upload-Offset header"), http.StatusBadRequest)
+	ErrNotFound                         = NewHTTPError(errors.New("upload not found"), http.StatusNotFound)
+	ErrFileLocked                       = NewHTTPError(errors.New("file currently locked"), 423) // Locked (WebDAV) (RFC 4918)
+	ErrMismatchOffset                   = NewHTTPError(errors.New("mismatched offset"), http.StatusConflict)
+	ErrSizeExceeded                     = NewHTTPError(errors.New("resource's size exceeded"), http.StatusRequestEntityTooLarge)
+	ErrNotImplemented                   = NewHTTPError(errors.New("feature not implemented"), http.StatusNotImplemented)
+	ErrUploadNotFinished                = NewHTTPError(errors.New("one of the partial uploads is not finished"), http.StatusBadRequest)
+	ErrInvalidConcat                    = NewHTTPError(errors.New("invalid Upload-Concat header"), http.StatusBadRequest)
+	ErrModifyFinal                      = NewHTTPError(errors.New("modifying a final upload is not allowed"), http.StatusForbidden)
+	ErrUploadLengthAndUploadDeferLength = NewHTTPError(errors.New("provided both Upload-Length and Upload-Defer-Length"), http.StatusBadRequest)
+	ErrInvalidUploadDeferLength         = NewHTTPError(errors.New("invalid Upload-Defer-Length header"), http.StatusBadRequest)
 )
 
 // UnroutedHandler exposes methods to handle requests as part of the tus protocol,