I'm not asking how to detect duplicate POST requests. I'm asking if we are supposed to. According to RFC 2616 (section 9.5), POST is used to submit some sort of record/resource/data to the server ...

The 1.0 version of the Hypertext Transfer Protocol, issued way back in 1996, only defined three HTTP verbs: GET, POST and HEAD. The most commonly used HTTP method is GET. The purpose of the GET method ...