inputCredentialStr: generateCredentialStr(
				"Z7IXGOO6BZ0REAN1Q26I",
				UTCNow().Format(yyyymmdd),
				"us-west-1",
				"ABCD",
				"ABCD"),
			expectedCredentials: credentialHeader{},
			expectedErrCode:     ErrInvalidServiceS3,
		},
		// Test Case - 7.
		// Test case with invalid region.
		{
			inputCredentialStr: generateCredentialStr(
				"Z7IXGOO6BZ0REAN1Q26I",
				UTCNow().Format(yyyymmdd),

				"X-Amz-Expires":       "60",
				"X-Amz-Signature":     "badsignature",
				"X-Amz-SignedHeaders": "host;x-amz-content-sha256;x-amz-date",
				"X-Amz-Credential":    fmt.Sprintf(credentialTemplate, "Z7IXGOO6BZ0REAN1Q26I", now.Format(yyyymmdd), "us-west-1"),
			},
			region:   "us-west-1",
			expected: ErrInvalidAccessKeyID,
		},
		// (2) Should NOT fail with an invalid region if it doesn't verify it.
		{