httpClient is initialised in buildApplication(configuration:) and is passed to ToDoController
Making a request and collecting the body of the response hits the fatalError.
Run
curl -v -X "POST" "127.0.0.1:8080"hits the fatalError in NIOCore library:
NIOCore/NIOThrowingAsyncSequenceProducer.swift:777: Fatal error: NIOThrowingAsyncSequenceProducer allows only a single AsyncIterator to be created