// Do not change this order, http time format dates
	// are usually in http.TimeFormat however there are
	// situations where for example aws-sdk-java doesn't
	// send the correct format.
	http.TimeFormat,
	"Mon, 2 Jan 2006 15:04:05 GMT",
}

// ParseHeader parses http.TimeFormat with an acceptable
// extension for http.TimeFormat - return time might be zero
// if the timeStr is invalid.

		12: {
			bucketName:         bucketName,
			newObjectName:      "newObject1",
			copySourceHeader:   url.QueryEscape(SlashSeparator + bucketName + SlashSeparator + objectName),
			copyModifiedHeader: "Mon, 02 Jan 2006 15:04:05 GMT",
			accessKey:          credentials.AccessKey,
			secretKey:          credentials.SecretKey,
			expectedRespStatus: http.StatusOK,
		},

	request, err = newTestSignedRequest(http.MethodHead, getHeadObjectURL(s.endPoint, bucketName, objectName),
		0, nil, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)
	request.Header.Set("If-Unmodified-Since", "Mon, 02 Jan 2006 15:04:05 +00:00")
	response, err = s.client.Do(request)
	c.Assert(err, nil)
	// Since the "If-Modified-Since" header was ahead in time compared to the actual