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HTTP tunnel
HTTP tunneling is a technique by which communications performed using various network protocols are encapsulated using the HTTP protocol, the network protocols in question usually belonging to the TCP/IP family of protocols. The HTTP protocol therefore acts as a wrapper for a channel that the network protocol being tunneled uses to communicate.
The HTTP stream with its covert channel is termed an HTTP tunnel.
HTTP tunnel software consists of client-server HTTP tunneling applications that integrate with existing application software, permitting them to be used in conditions of restricted network connectivity including firewalled networks, networks behind proxy servers, and network address translation.
== Usage ==
An HTTP tunnel is used most often as a means for communication from network locations with restricted connectivity – most often behind NATs, firewalls, or proxy servers, and most often with applications that lack native support for communication in such conditions of restricted connectivity. Restricted connectivity in the form of blocked TCP/IP ports, blocking traffic initiated from outside the network, or blocking of all network protocols except a few is a commonly used method to lock down a network to secure it against internal and external threats.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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