This post is origin post at https://stackoverflow.com/q/40018619/306719, but got no attention, and I found this site, so I think here maybe the right place, and I will apply for a redirection for the origin post.
I want to provide a http based service to insert new post with extra information, I think wordpress plugin maybe the right place.
However I am not sure how to get started event I read the plugin reference from wordpress.
I think there should be some action like
request_recieve where I can registered to intercept the request and do my own job, but I can not find that. Also how to avoid blocking the normal wordpress request.