mockResponse = mockResponse.setBody(Buffer())
    mockResponse = mockResponse.setChunkedBody(Buffer(), 0)
    mockResponse = mockResponse.setChunkedBody("", 0)
    var socketPolicy: SocketPolicy = mockResponse.socketPolicy
    mockResponse.socketPolicy = SocketPolicy.KEEP_OPEN
    var http2ErrorCode: Int = mockResponse.http2ErrorCode
    mockResponse.http2ErrorCode = 0
    mockResponse = mockResponse.throttleBody(0L, 0L, TimeUnit.SECONDS)

    use chunked encoding. This is different from an empty list - that indicates the request is
    chunked but has no data.

 *  Breaking: Replace `SocketPolicy` with a new type, `SocketEffect`. It splits triggers (request
    start, response body, etc.) from effects (closing the socket, closing the stream, etc.).