type testCase struct {
		req   *http.Request
		authT authType
	}
	nopCloser := io.NopCloser(io.LimitReader(&nullReader{}, 1024))
	testCases := []testCase{
		// Test case - 1
		// Check for generic signature v4 header.
		{
			req: &http.Request{
				URL: &url.URL{
					Host:   "127.0.0.1:9000",
					Scheme: httpScheme,
					Path:   SlashSeparator,
				},
				Header: http.Header{