int64(buffer1.Len()), buffer1, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)
	// set Content-Md5 to invalid value.
	request.Header.Set("Content-Md5", "kvLTlMrX9NpYDQlEIFlnDA==")
	// expecting a failure during upload.
	response, err = s.client.Do(request)
	c.Assert(err, nil)
	// Since Content-Md5 header was wrong, expecting to fail with "SignatureDoesNotMatch" error.

					// Used in test case  6.
				case BadSignature:
					req.Header.Set("authorization", req.Header.Get("authorization")+"a")
					// Setting an invalid Content-MD5 to force a Md5 Mismatch error.
					// Used in tesr case 7.
				case BadMD5:
					req.Header.Set("Content-MD5", "badmd5")
				}

				// invoke the PutObjectPart HTTP handler.
				apiRouter.ServeHTTP(rec, req)

				// validate the error response.

		md5hex = "" // Do not try to verify the content.
		sha256hex = ""
	}

	var forceMD5 []byte
	// Optimization: If SSE-KMS and SSE-C did not request Content-Md5. Use uuid as etag. Optionally enable this also
	// for server that is started with `--no-compat`.