PublishRequest<T> IBus extension equivalent in v5.x - masstransit

Question

With v5 PublishRequest extension was removed from the IBus interface.
We used the callback to handle multiple response types that could be returned from the consumer ( Faults, Validations, actual responses, etc )
What is the equivalent way of publishing a message and wiring up multiple response types ?
// Request/Response contracts, may also return validation failure or fault contract
Request<TMessage> request = await bus.PublishRequest<TMessage>( msg, context => {
context.Handle<TResponse>( value => ... );
context.Handle<TValidation>( value => ... );
context.Handle<Fault>( value => ... );
context.CorrelationId = ...
context.Headers.Set( ... );
});
await request.Task;

Answer 1

You can use the new syntax, which is much cleaner overall.
var client = Bus.CreateRequestClient<RegisterMember>();
var (registered, existing) =
await client.GetResponse<MemberRegistered, ExistingMemberFound>(
new RegisterMember() {MemberId = "Johnny5"});
This will return either of the two responses, and if a fault occurs, either will throw the faulted request exception.
You can also use a request handle to add headers, etc.
var client = Bus.CreateRequestClient<RegisterMember>();
var request = client.Create(new RegisterMember()
{MemberId = "Johnny5"});
// the request is also the send pipe configurator, so...
request.UseExecute(context => context.CorrelationId = someId);
var (registered, existing) =
await request.GetResponse<MemberRegistered, ExistingMemberFound>();
You can see a working test case in the future tests:
https://github.com/MassTransit/MassTransit/blob/develop/src/MassTransit.Futures.Tests/Request_Specs.cs#L170