func (r *CondCheck) Init(bucket, object string, header http.Header) {
	r.Key = object
	r.Bucket = bucket

	ifModifiedSinceHeader := header.Get(xhttp.IfModifiedSince)
	if ifModifiedSinceHeader != "" {
		if givenTime, err := amztime.ParseHeader(ifModifiedSinceHeader); err == nil {
			r.IfModifiedSince = &givenTime
		}
	}
	ifUnmodifiedSinceHeader := header.Get(xhttp.IfUnmodifiedSince)
	if ifUnmodifiedSinceHeader != "" {

	// otherwise return a 304 (not modified).
	ifModifiedSinceHeader := r.Header.Get(xhttp.IfModifiedSince)
	if ifModifiedSinceHeader != "" {
		if givenTime, err := amztime.ParseHeader(ifModifiedSinceHeader); err == nil {
			if !ifModifiedSince(objInfo.ModTime, givenTime) {
				// If the object is not modified since the specified time.
				writeHeadersPrecondition(w, objInfo)

				err = msgp.WrapError(err, "IfNoneMatch")
				return
			}
		case "IfModifiedSince":
			if dc.IsNil() {
				err = dc.ReadNil()
				if err != nil {
					err = msgp.WrapError(err, "IfModifiedSince")
					return
				}
				z.IfModifiedSince = nil
			} else {
				if z.IfModifiedSince == nil {
					z.IfModifiedSince = new(time.Time)
				}
				*z.IfModifiedSince, err = dc.ReadTime()
				if err != nil {

    public boolean getUseCaches () {
        return this.connection.getUseCaches();
    }


    @Override
    public void setIfModifiedSince ( long ifModifiedSince ) {
        this.connection.setIfModifiedSince(ifModifiedSince);
        this.ifModifiedSince = ifModifiedSince;
    }


    @Override
    public long getIfModifiedSince () {
        return this.connection.getIfModifiedSince();
    }

    }

    public boolean getUseCaches() {
        return connection.getUseCaches();
    }

    public void setIfModifiedSince(long ifModifiedSince) {
        connection.setIfModifiedSince(ifModifiedSince);
        this.ifModifiedSince = ifModifiedSince;
    }

    public long getIfModifiedSince() {
        return connection.getIfModifiedSince();
    }

    public boolean getDefaultUseCaches() {

	Range              = "Range"
)

// Non standard S3 HTTP response constants
const (
	XCache       = "X-Cache"
	XCacheLookup = "X-Cache-Lookup"
)

// Standard S3 HTTP request constants
const (
	IfModifiedSince   = "If-Modified-Since"
	IfUnmodifiedSince = "If-Unmodified-Since"
	IfMatch           = "If-Match"
	IfNoneMatch       = "If-None-Match"

	// Request tags used in GetObjectAttributes
	Checksum     = "Checksum"