make sure you can write a script calling: POST GET and analyze the responses. not very hard, they give you 1.5 hours for this exercise. after you finish - the interviewer is coming over to review your code and results. he said mine was very good and that the exercise is 100% after 4 days I got an email saying that I didn't pass to the next step. a bit of surprise but I am pretty sure that it wasn't on professional basis.