Tezos_proxySourceCode related to the light mode that is protocol-independent. See src/proto_*/lib_client/light.ml files for protocol-dependent code.
Code that is used both by protocol-dependent code and by other code. Note that we don't want this code in proxy_proto.ml because it's independent from the protocol and we neither want this code in proxy_getter.ml, because it would create a cyclic dependency between proxy_proto.ml and proxy_getter.ml