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public T ajax(String url, Class type, long expire, long fresh,
AjaxCallback callback)
Unlike expire parameter, if the remote connection is available, the data
do not come from the cache.
Examples:
Expire: 1 month
Fresh: 1 day
With less than a day, the cached data is always returned.
After two days, when the call fail, the cached data is returned. If the
call work, the remote data is cached and returned.
After a month, the cache is no longer valid and if the call fails, no
data is returned.