https://7cdt3b60tj.execute-api.us-east-1.amazonaws.com/play?choice=rock https://7cdt3b60tj.execute-api.us-east-1.amazonaws.com/play?choice=paper https://7cdt3b60tj.execute-api.us-east-1.amazonaws.com/play?choice=scissors
As you can see above, you can change your option changing a parameter in the URL.
The computer option is random.
To see in action, please see the video (I removed the lambda to avoid costs problems). https://www.youtube.com/watch?v=z88BGFlYMu0&feature=youtu.be