per request headers

[tyro-jason]

Hi There,

I added a static creator method modelled on the Util static methods to create a proxy, but with a Supplier<> instead of just a Map<String,String> to give me per request headers for things like tracing and auth...

    private static <T> T createClientProxy(ClassLoader classLoader, Class<T> proxyInterface, final IJsonRpcClient client, final Supplier<Map<String, String>> perRequestHeaderSupplier) {

        return (T) Proxy.newProxyInstance(classLoader, new Class<?>[]{proxyInterface}, (proxy, method, args) -> {
            if (method.getDeclaringClass() == Object.class) return proxyObjectMethods(method, proxy, args);

            final Object arguments = ReflectionUtil.parseArguments(method, args);
            final String methodName = method.getName();
            return client.invoke(methodName, arguments, method.getGenericReturnType(), perRequestHeaderSupplier.get());
        });
    }