1.3.3 HTTP Proxy Use

In certain network topologies, the connection from the client to an RPC over HTTP proxy has to go through an HTTP proxy. Thus before establishing a connection to the RPC over HTTP proxy, the client is required to determine whether a HTTP proxy is required to be used.

To do this determination, the client tries sending a message both with and without using an HTTP proxy.  If it gets a response without using an HTTP proxy, then it does not use the HTTP proxy for subsequent communication.  If it gets a response only by using an HTTP proxy, then it uses the HTTP proxy for subsequent communication.

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