ExportErrRequestCanceled          = errRequestCanceled
	ExportErrRequestCanceledConn      = errRequestCanceledConn
	ExportErrServerClosedIdle         = errServerClosedIdle
	ExportServeFile                   = serveFile
	ExportScanETag                    = scanETag
	ExportHttp2ConfigureServer        = http2ConfigureServer
	Export_shouldCopyHeaderOnRedirect = shouldCopyHeaderOnRedirect

// Issue 12991
func TestServerFileStatError(t *testing.T) {
	rec := httptest.NewRecorder()
	r, _ := NewRequest("GET", "http://foo/", nil)
	redirect := false
	name := "file.txt"
	fs := issue12991FS{}
	ExportServeFile(rec, r, fs, name, redirect)
	if body := rec.Body.String(); !strings.Contains(body, "403") || !strings.Contains(body, "Forbidden") {
		t.Errorf("wanted 403 forbidden message; got: %s", body)
	}
}