RPCClient.batch

import std.typecons : Yes;

interface API {
    void func1(int a);
    long func2(string s);
    long func3();
}
auto client = RPCClient!API("localhost", 54321);

auto responses = client.batch(
        batchReq("func1", JSONValue(50)),
        batchReq("func1", JSONValue(-1), Yes.notify),
        batchReq("func2", JSONValue("hello")),
        batchReq("func3", JSONValue(), Yes.notify),
        batchReq("func1", JSONValue(123))
);