When cloud-based applications use other cloud-based services, errors can occur because of temporary conditions such as intermittent service, infrastructure-level faults, or network issues. Very often, if you retry the operation a short time later (maybe only a few milliseconds later) the operation may succeed
مکانیسمهای سعی مجدد و نادیده گرفتن خطاهای زودگذر با Microsoft Enterprise Library
301, MovedPermanently