The OPEN Intelligent Security Application Programming Interface (ISAPI) is a text protocol inRESTful style based on HTTP for communicating between security devices/servers (e.g., cameras,DVR, NVR, etc.) and client software/system. It defines the communication standard betweendevice/server and client software/system via the Internet Protocol (IP), see the network topologyand communication protocol layer framework in the figures below.
REST (REpresentational State Transfer) is a protocol design method which abstracts all informationas the resources. The abstracted resources are marked by the uniform identifies, i.e., URI (UniformResource Identifiers) for simple and extendable management
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You can download API in: https://stfly.me/hikvision_api_isapi-core