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You have misunderstood the requirement. The client-side does not need access to the server-side c or python source code, but it does need access to the message definition files generated from the .srv file. Those message definitions are what is in the '.h` file in the example documentation.

These message definitions are often created in a different ros package from the server-side node, precisely because this ros package needs to be installed on both client- and server-side hosts.