2.2.6.24 X-Proxy-Client-Agent
The X-Proxy-Client-Agent header is sent by intermediate devices (such as proxy servers) and specifies the information that the original client who initiated the RTSP request specified in the User-Agent header.
Because each intermediate device replaces the information on the User-Agent header with its own information, the X-Proxy-Client-Agent header enables the information on the original User-Agent header to be preserved and forwarded across possibly multiple intermediate devices to the server.
This header is defined only for requests sent to a server by an intermediate device, such as a proxy server that is acting as a client.
The syntax of the X-Proxy-Client-Agent header is as follows:
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X-Proxy-Client-Agent = "X-Proxy-Client-Agent: " user-agent-data ; defined in section 2.2.6.9.