req, err := newTestRequest(method, urlStr, contentLength, body)
	if err != nil {
		return nil, err
	}

	// Anonymous request return early.
	if accessKey == "" || secretKey == "" {
		return req, nil
	}

	if signer == signerV2 {
		err = signRequestV2(req, accessKey, secretKey)
		req.Header.Del("x-amz-content-sha256")
	} else {