This is the main URL that is used when an interview is running. Answers are posted to this URL using the format described in Logging and the result is returned in the format described in Errors. When the answer is correct, the response includes the next question and the URL to which the response, to that question, should be posted. The Interview web service takes the post input, merges in the parameters from the URL, and calls PostInterviewEvent() with that data. When the response is received from the session engine, it is slightly adapted (as described in Errors) and returned to the client.